Method for transmitting and receiving downlink data in wireless communication system, and device for same

ABSTRACT

A method for transmitting and receiving downlink data in a wireless communication system, and a device for same are disclosed. Specifically, the method includes the steps of: receiving setting information; receiving downlink control information (DCI); and receiving a plurality of transmission occasions of the same transport block based on the DCI, wherein a repetition scheme based on time division multiplexing (TDM) is set based on the setting information, the DCI includes a time domain resource assignment field, resource allocation in a time domain for a first transmission occasion may be determined based on the time domain resource assignment field of the DCI, and the resource allocation in the time domain for a second transmission occasion may be determined based on the resource allocation in the time domain for the first transmission occasion.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.17/671,110, filed on Feb. 14, 2022, which pursuant to 35 U.S.C. §119(e), is a continuation of International Application No.PCT/KR2020/010924, filed on Aug. 14, 2020, which claims the benefit ofU.S. Provisional Application No. 62/886,947, filed on Aug. 14, 2019, No.62/891,241, filed on Aug. 23, 2019, No. 62/896,014, filed on Sep. 5,2019, and KR Application No. 10-2019-0099951, filed on Aug. 14, 2019,No. 10-2019-0107789, filed on Aug. 30, 2019, No. 10-2019-0122727, filedon Oct. 3, 2019, No. 10-2019-0127364, filed on Oct. 14, 2019, No.10-2019-0143016, filed on Nov. 8, 2019, the contents of which are allhereby incorporated by reference herein in their entirety.

TECHNICAL FIELD

The present disclosure relates to a wireless communication system, andmore particularly, to a method for transmitting and receiving downlinkdata based on multiple transmission reception points (TRPs), and adevice for supporting the same.

BACKGROUND ART

Mobile communication systems have been developed to provide a voiceservice while ensuring the activity of a user. However, in the mobilecommunication system, not only a voice, but also a data service isextended. At present, there is a shortage of resources due to anexplosive increase in traffic, and users demand a higher speed service.As a result, a more advanced mobile communication system is required.

Requirements for a next-generation mobile communication system should beable to support the acceptance of explosive data traffic, a dramaticincrease in the per-user data rate, the acceptance of a significantincrease in the number of connected devices, very low end-to-endlatency, and high-energy efficiency. To this end, various technologiesare researched, which include dual connectivity, massive multiple inputmultiple output (MIMO), in-band full duplex, non-orthogonal multipleaccess (NOMA), super wideband support, device networking, and the like.

SUMMARY

The present disclosure proposes a method for receiving, by a UEsupported by multiple transmission reception points (TRPs), downlinkdata in a wireless communication system.

Specifically, the present disclosure proposes a method for configuring ascheme (e.g., eMBB operation or URLLC operation) in which multiple TRPsperform cooperative transmission.

Further, the present disclosure proposes a method for configuring aspecific scheme among various schemes related to a URLLC M-TRPoperation.

Further, the present disclosure proposes a method for configuring thenumber of times at which transmission occasions corresponding to thesame transport block are repeatedly transmitted by considering a TDMbased URLLC M-TRP operation.

Further, the present disclosure proposes a method for configuring aresource of a time domain in which transmission occasions correspondingto the same transport block are repeatedly transmitted by consideringthe TDM based URLLC M-TRP operation.

Further, the present disclosure proposes a method for configuring afield (e.g., TCI field) of DCI by considering an M-TRP operation.

The technical objects of the present disclosure are not limited to theaforementioned technical objects, and other technical objects, which arenot mentioned above, will be apparently appreciated by a person havingordinary skill in the art from the following description.

A method for receiving, by a user equipment (UE), downlink data in awireless communication system according to an embodiment of the presentdisclosure may include: receiving configuration information, arepetition scheme based on time division multiplexing (TDM) beingconfigured based on the configuration information; receiving downlinkcontrol information (DCI), the DCI including a time domain resourceassignment field; and receiving a plurality of transmission occasions ofthe same transport block based on the DCI, in which resource assignmentin a time domain for a first transmission occasion may be determinedbased on the time domain resource assignment field of the DCI, andresource assignment in the time domain for a second transmissionoccasion may be determined based on the resource assignment in the timedomain for the first transmission occasion.

Further, in the method according to an embodiment of the presentdisclosure, a size of a second resource in the time domain for thesecond transmission occasion may be determined based on a size of afirst resource in the time domain for the first transmission occasion,and the size of the first resource and the size of the second resourcemay be equal to each other.

Further, in the method according to an embodiment of the presentdisclosure, the first resource and the second resource may beconstituted as a unit of 2, 4, or 7 OFDM symbols.

Further, in the method according to an embodiment of the presentdisclosure, a first symbol of the second resource may be positioned froma last symbol of the first resource after a specific number of symbols.

Further, the method according to an embodiment of the present disclosuremay further include receiving information on the specific number ofsymbols.

Further, in the method according to an embodiment of the presentdisclosure, in the method, the first resource and the second resourcemay be positioned in concatenation with each other in the time domain.

Further, in the method according to an embodiment of the presentdisclosure, the DCI may further include a transmission configurationindication (TCI) field, and a plurality of TCI states may be indicatedbased on the TCI field, and the number of the plurality of transmissionoccasions may be determined based on the number of plurality of TCIstates.

Further, in the method according to an embodiment of the presentdisclosure, a first TCI state may correspond to the first transmissionoccasion and a second TCI state may correspond to the secondtransmission occasion.

Further, in the method according to an embodiment of the presentdisclosure, the first transmission occasion and the second transmissionoccasion may be received in one slot.

Further, in the method according to an embodiment of the presentdisclosure, the DCI may further include a redundancy version (RV) field,and an RV value of the first transmission occasion and an RV value ofthe second transmission occasion may be differently configured based onthe RV field.

A user equipment (UE) for receiving downlink data in a wirelesscommunication system according to an embodiment of the presentdisclosure may include: one or more transceivers; one or moreprocessors; and one or more memories storing instructions for operationsexecuted by the one or more processors and connected to the one or moreprocessors, in which the operations may include receiving configurationinformation, a repetition scheme based on time division multiplexing(TDM) being configured based on the configuration information, receivingdownlink control information (DCI), the DCI including a time domainresource assignment field, and receiving a plurality of transmissionoccasions of the same transport block based on the DCI, in whichresource assignment in a time domain for a first transmission occasionmay be determined based on the time domain resource assignment field ofthe DCI, and resource assignment in the time domain for a secondtransmission occasion may be determined based on the resource assignmentin the time domain for the first transmission occasion.

A method for transmitting, by a base station (BS), downlink data in awireless communication system according to an embodiment of the presentdisclosure may include: transmitting, to a user equipment (UE),configuration information, a repetition scheme based on time divisionmultiplexing (TDM) being configured based on the configurationinformation; transmitting, to the UE, downlink control information(DCI), the DCI including a time domain resource assignment field, andtransmitting, to the UE, a plurality of transmission occasions of thesame transport block based on the DCI, in which resource assignment in atime domain for a first transmission occasion may be determined based onthe time domain resource assignment field of the DCI, and resourceassignment in the time domain for a second transmission occasion may bedetermined based on the resource assignment in the time domain for thefirst transmission occasion.

A base station (BS) for transmitting downlink data in a wirelesscommunication system according to an embodiment of the presentdisclosure may include: one or more transceivers; one or moreprocessors; and one or more memories storing instructions for operationsexecuted by the one or more processors and connected to the one or moreprocessors, in which the operations may include transmitting, to a userequipment (UE), configuration information, a repetition scheme based ontime division multiplexing (TDM) being configured based on theconfiguration information, transmitting, to the UE, downlink controlinformation (DCI), the DCI including a time domain resource assignmentfield, and transmitting, to the UE, a plurality of transmissionoccasions of the same transport block based on the DCI, and resourceassignment in a time domain for a first transmission occasion may bedetermined based on the time domain resource assignment field of theDCI, and resource assignment in the time domain for a secondtransmission occasion may be determined based on the resource assignmentin the time domain for the first transmission occasion.

A device according to an embodiment of the present disclosure mayinclude: one or more memories and one or more processors functionallyconnected to the one or more memories, in which the one or moreprocessors may be configured to control the device to receiveconfiguration information, receive downlink control information (DCI),and receive a plurality of transmission occasions of the same transportblock based on the DCI, and a repetition scheme based on time divisionmultiplexing (TDM) may be configured based on the configurationinformation, the DCI includes a time domain resource assignment field,resource assignment in a time domain for a first transmission occasionmay be determined based on the time domain resource assignment field ofthe DCI, and resource assignment in the time domain for a secondtransmission occasion may be determined based on the resource assignmentin the time domain for the first transmission occasion.

In one or more non-transitory computer-readable media storing one ormore instructions according to an embodiment of the present disclosure,the one or more instructions executable by one or more processors mayinclude instructions for instructing a user equipment (UE) to receiveconfiguration information; receive downlink control information (DCI);and receive a plurality of transmission occasions of the same transportblock based on the DCI, and a repetition scheme based on time divisionmultiplexing (TDM) may be configured based on the configurationinformation, the DCI may include a time domain resource assignmentfield, resource assignment in a time domain for a first transmissionoccasion may be determined based on the time domain resource assignmentfield of the DCI, and resource assignment in the time domain for asecond transmission occasion may be determined based on the resourceassignment in the time domain for the first transmission occasion.

According to an embodiment of the present disclosure, an operationscheme of multiple TRPs can be configured to a UE and the UE can performan operation corresponding thereto.

Further, according to an embodiment of the present disclosure, thenumber (the number of repetition times of transmission occasions) oftransmission occasions corresponding to the same transport block in TDMbased M-TRP URLLC transmission can be configured.

Further, according to an embodiment of the present disclosure, ashifting symbol and/or RV values can be configured for each transmissionoccasion.

Further, according to an embodiment of the present disclosure, aresource region can be determined in which the transmission occasionscorresponding to the same transport block are received in the TDM basedM-TRP URLLC transmission.

Further, according to an embodiment of the present disclosure, aconventional DCI field can be configured or interpreted to suit an M-TRPoperation.

Effects which may be obtained from the present disclosure are notlimited by the above effects, and other effects that have not beenmentioned may be clearly understood from the following description bythose skilled in the art to which the present disclosure pertains

DESCRIPTION OF DRAWINGS

The accompany drawings, which are included to provide a furtherunderstanding of the present disclosure and are incorporated on andconstitute a part of this specification illustrate embodiments of thepresent disclosure and together with the description serve to explainthe principles of the present disclosure.

FIG. 1 is a diagram illustrating an example of an overall systemstructure of NR to which a method proposed in the present disclosure maybe applied.

FIG. 2 illustrates a relationship between an uplink frame and a downlinkframe in a wireless communication system to which a method proposed inthe present disclosure may be applied.

FIG. 3 illustrates an example of a frame structure in an NR system.

FIG. 4 illustrates an example of a resource grid supported by a wirelesscommunication system to which a method proposed in the presentdisclosure may be applied.

FIG. 5 illustrates examples of a resource grid for each antenna port andnumerology to which a method proposed in the present disclosure may beapplied.

FIG. 6 illustrates physical channels and general signal transmission.

FIG. 7 illustrates an example of a downlink transmission/receptionoperation.

FIG. 8 illustrates an example of an uplink transmission/receptionoperation.

FIG. 9 is a flowchart illustrating an example of a DL DMRS procedure.

FIGS. 10A and 10B illustrate an example of a transmission/receptionmethod for improving reliability using transmission in multiple TRPs.

FIG. 11 illustrates an example of a configuration of a shifting symbolbetween transmission occasions.

FIG. 12 illustrates an example of a transmission occasion repeatedlytransmitted in one slot.

FIG. 13 illustrates an example of resource allocation for repeatedtransmission in a time domain proposed in the present disclosure.

FIG. 14 illustrates an example of slot unit repeated transmission basedon a transmission occasion structure defined in a first slot in order toprevent repeated transmission by exceeding one slot.

FIG. 15 illustrates an example of resource allocation to a transmissionoccasion exceeding a slot boundary according to a method proposed in thepresent disclosure.

FIG. 16 illustrates an example of a time domain resource allocationmethod when a transmission occasion exceeding a slot boundary occurs towhich the method proposed in the present disclosure may be applied.

FIG. 17 illustrates an example of application of a DMRS pattern torepeatedly transmitted transmission occasions.

FIG. 18 illustrates an example of a signalling procedure performing datatransmission/reception between a network side and a UE in a situation ofmultiple TRPs to which methods and/or embodiments described in thepresent disclosure are applicable.

FIG. 19 illustrates an example of an operation flow chart of a UEperforming data transmission/reception to which methods and/orembodiments described in the present disclosure are applicable.

FIG. 20 illustrates an example of an operation flowchart of a BSperforming data transmission and reception to which a method and/or anembodiment proposed in the present disclosure may be applied.

FIG. 21 illustrates a communication system applied to the presentdisclosure.

FIG. 22 illustrates a wireless device which may be applied to thepresent disclosure.

FIG. 23 illustrates a signal processing circuit for a transmit signal.

FIG. 24 illustrates another example of a wireless device applied to thepresent disclosure.

FIG. 25 illustrates a portable device applied to the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments of the presentdisclosure, examples of which are illustrated in the accompanyingdrawings. A detailed description to be disclosed below together with theaccompanying drawing is to describe exemplary embodiments of the presentdisclosure and not to describe a unique embodiment for carrying out thepresent disclosure. The detailed description below includes details toprovide a complete understanding of the present disclosure. However,those skilled in the art know that the present disclosure may be carriedout without the details.

In some cases, in order to prevent a concept of the present disclosurefrom being ambiguous, known structures and devices may be omitted orillustrated in a block diagram format based on core functions of eachstructure and device.

Hereinafter, downlink (DL) means communication from the base station tothe terminal and uplink (UL) means communication from the terminal tothe base station. In downlink, a transmitter may be part of the basestation, and a receiver may be part of the terminal. In uplink, thetransmitter may be part of the terminal and the receiver may be part ofthe base station. The base station may be expressed as a firstcommunication device and the terminal may be expressed as a secondcommunication device. A base station (BS) may be replaced with termsincluding a fixed station, a Node B, an evolved-NodeB (eNB), a NextGeneration NodeB (gNB), a base transceiver system (BTS), an access point(AP), a network (5G network), an AI system, a road side unit (RSU), avehicle, a robot, an Unmanned Aerial Vehicle (UAV), an Augmented Reality(AR) device, a Virtual Reality (VR) device, and the like. Further, theterminal may be fixed or mobile and may be replaced with terms includinga User Equipment (UE), a Mobile Station (MS), a user terminal (UT), aMobile Subscriber Station (MSS), a Subscriber Station (SS), an AdvancedMobile Station (AMS), a Wireless Terminal (WT), a Machine-TypeCommunication (MTC) device, a Machine-to-Machine (M2M) device, and aDevice-to-Device (D2D) device, the vehicle, the robot, an AI module, theUnmanned Aerial Vehicle (UAV), the Augmented Reality (AR) device, theVirtual Reality (VR) device, and the like.

The following technology may be used in various radio access systemincluding CDMA, FDMA, TDMA, OFDMA, SC-FDMA, and the like. The CDMA maybe implemented as radio technology such as Universal Terrestrial RadioAccess (UTRA) or CDMA2000. The TDMA may be implemented as radiotechnology such as a global system for mobile communications(GSM)/general packet radio service (GPRS)/enhanced data rates for GSMevolution (EDGE). The OFDMA may be implemented as radio technology suchas Institute of Electrical and Electronics Engineers (IEEE) 802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), or thelike. The UTRA is a part of Universal Mobile Telecommunications System(UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution(LTE) is a part of Evolved UMTS (E-UMTS) using the E-UTRA andLTE-Advanced (A)/LTE-A pro is an evolved version of the 3GPP LTE. 3GPPNR (New Radio or New Radio Access Technology) is an evolved version ofthe 3GPP LTE/LTE-A/LTE-A pro.

For clarity of description, the technical spirit of the presentdisclosure is described based on the 3GPP communication system (e.g.,LTE-A or NR), but the technical spirit of the present disclosure are notlimited thereto. LTE means technology after 3GPP TS 36.xxx Release 8. Indetail, LTE technology after 3GPP TS 36.xxx Release 10 is referred to asthe LTE-A and LTE technology after 3GPP TS 36.xxx Release 13 is referredto as the LTE-A pro. The 3GPP NR means technology after TS 38.xxxRelease 15. The LTE/NR may be referred to as a 3GPP system. “xxx” meansa detailed standard document number. The LTE/NR may be collectivelyreferred to as the 3GPP system. Matters disclosed in a standard documentopened before the present disclosure may be referred to for a backgroundart, terms, omissions, etc., used for describing the present disclosure.For example, the following documents may be referred to.

3GPP LTE

-   -   36.211: Physical channels and modulation    -   36.212: Multiplexing and channel coding    -   36.213: Physical layer procedures    -   36.300: Overall description    -   36.331: Radio Resource Control (RRC)

3GPP NR

-   -   38.211: Physical channels and modulation    -   38.212: Multiplexing and channel coding    -   38.213: Physical layer procedures for control    -   38.214: Physical layer procedures for data    -   38.300: NR and NG-RAN Overall Description    -   36.331: Radio Resource Control (RRC) protocol specification

As more and more communication devices require larger communicationcapacity, there is a need for improved mobile broadband communicationcompared to the existing radio access technology (RAT). Further, massivemachine type communications (MTCs), which provide various servicesanytime and anywhere by connecting many devices and objects, are one ofthe major issues to be considered in the next generation communication.In addition, a communication system design considering a service/UEsensitive to reliability and latency is being discussed. Theintroduction of next generation radio access technology consideringenhanced mobile broadband communication (eMBB), massive MTC (mMTC),ultra-reliable and low latency communication (URLLC) is discussed, andin the present disclosure, the technology is called new RAT forconvenience. The NR is an expression representing an example of 5G radioaccess technology (RAT).

Three major requirement areas of 5G include (1) an enhanced mobilebroadband (eMBB) area, (2) a massive machine type communication (mMTC)area and (3) an ultra-reliable and low latency communications (URLLC)area.

Some use cases may require multiple areas for optimization, and otheruse case may be focused on only one key performance indicator (KPI). 5Gsupport such various use cases in a flexible and reliable manner.

eMBB is far above basic mobile Internet access and covers media andentertainment applications in abundant bidirectional tasks, cloud oraugmented reality. Data is one of key motive powers of 5G, and dedicatedvoice services may not be first seen in the 5G era. In 5G, it isexpected that voice will be processed as an application program using adata connection simply provided by a communication system. Major causesfor an increased traffic volume include an increase in the content sizeand an increase in the number of applications that require a high datatransfer rate. Streaming service (audio and video), dialogue type videoand mobile Internet connections will be used more widely as more devicesare connected to the Internet. Such many application programs requireconnectivity always turned on in order to push real-time information andnotification to a user. A cloud storage and application suddenlyincreases in the mobile communication platform, and this may be appliedto both business and entertainment. Furthermore, cloud storage is aspecial use case that tows the growth of an uplink data transfer rate.5G is also used for remote business of cloud. When a tactile interfaceis used, further lower end-to-end latency is required to maintainexcellent user experiences. Entertainment, for example, cloud game andvideo streaming are other key elements which increase a need for themobile broadband ability. Entertainment is essential in the smartphoneand tablet anywhere including high mobility environments, such as atrain, a vehicle and an airplane. Another use case is augmented realityand information search for entertainment. In this case, augmentedreality requires very low latency and an instant amount of data.

Furthermore, one of the most expected 5G use case relates to a functioncapable of smoothly connecting embedded sensors in all fields, that is,mMTC. Until 2020, it is expected that potential IoT devices will reach20.4 billions. The industry IoT is one of areas in which 5G performsmajor roles enabling smart city, asset tracking, smart utility,agriculture and security infra.

URLLC includes a new service which will change the industry throughremote control of major infra and a link having ultra-reliability/lowavailable latency, such as a self-driving vehicle. A level ofreliability and latency is essential for smart grid control, industryautomation, robot engineering, drone control and adjustment.

Multiple use cases are described more specifically.

5G may supplement fiber-to-the-home (FTTH) and cable-based broadband (orDOCSIS) as means for providing a stream evaluated from gigabits persecond to several hundreds of mega bits per second. Such fast speed isnecessary to deliver TV with resolution of 4K or more (6K, 8K or more)in addition to virtual reality and augmented reality. Virtual reality(VR) and augmented reality (AR) applications include immersive sportsgames. A specific application program may require a special networkconfiguration. For example, in the case of VR game, in order for gamecompanies to minimize latency, a core server may need to be integratedwith the edge network server of a network operator.

An automotive is expected to be an important and new motive power in 5G,along with many use cases for the mobile communication of an automotive.For example, entertainment for a passenger requires a high capacity anda high mobility mobile broadband at the same time. The reason for thisis that future users continue to expect a high-quality connectionregardless of their location and speed. Another use example of theautomotive field is an augmented reality dashboard. The augmentedreality dashboard overlaps and displays information, identifying anobject in the dark and notifying a driver of the distance and movementof the object, over a thing seen by the driver through a front window.In the future, a wireless module enables communication betweenautomotives, information exchange between an automotive and a supportedinfrastructure, and information exchange between an automotive and otherconnected devices (e.g., devices accompanied by a pedestrian). A safetysystem guides alternative courses of a behavior so that a driver maydrive more safely, thereby reducing a danger of an accident. A next stepwill be a remotely controlled or self-driven vehicle. This requires veryreliable, very fast communication between different self-driven vehiclesand between an automotive and infra. In the future, a self-drivenvehicle may perform all driving activities, and a driver will be focusedon things other than traffic, which cannot be identified by anautomotive itself. Technical requirements of a self-driven vehiclerequire ultra-low latency and ultra-high speed reliability so thattraffic safety is increased up to a level which cannot be achieved by aperson.

A smart city and smart home mentioned as a smart society will beembedded as a high-density radio sensor network. The distributed networkof intelligent sensors will identify the cost of a city or home and acondition for energy-efficient maintenance. A similar configuration maybe performed for each home. All of a temperature sensor, a window andheating controller, a burglar alarm and home appliances are wirelesslyconnected. Many of such sensors are typically a low data transfer rate,low energy and a low cost. However, for example, real-time HD video maybe required for a specific type of device for surveillance.

The consumption and distribution of energy including heat or gas arehighly distributed and thus require automated control of a distributedsensor network. A smart grid collects information, and interconnectssuch sensors using digital information and a communication technology sothat the sensors operate based on the information. The information mayinclude the behaviors of a supplier and consumer, and thus the smartgrid may improve the distribution of fuel, such as electricity, in anefficient, reliable, economical, production-sustainable and automatedmanner. The smart grid may be considered to be another sensor networkhaving small latency.

A health part owns many application programs which reap the benefits ofmobile communication. A communication system may support remotetreatment providing clinical treatment at a distant place. This helps toreduce a barrier for the distance and may improve access to medicalservices which are not continuously used at remote farming areas.Furthermore, this is used to save life in important treatment and anemergency condition. A radio sensor network based on mobilecommunication may provide remote monitoring and sensors for parameters,such as the heart rate and blood pressure.

Radio and mobile communication becomes increasingly important in theindustry application field. Wiring requires a high installation andmaintenance cost. Accordingly, the possibility that a cable will bereplaced with reconfigurable radio links is an attractive opportunity inmany industrial fields. However, to achieve the possibility requiresthat a radio connection operates with latency, reliability and capacitysimilar to those of the cable and that management is simplified. Lowlatency and a low error probability is a new requirement for aconnection to 5G.

Logistics and freight tracking is an important use case for mobilecommunication, which enables the tracking inventory and packagesanywhere using a location-based information system. The logistics andfreight tracking use case typically requires a low data speed, but awide area and reliable location information.

In a new RAT system including NR uses an OFDM transmission scheme or asimilar transmission scheme thereto. The new RAT system may follow OFDMparameters different from OFDM parameters of LTE. Alternatively, the newRAT system may follow numerology of conventional LTE/LTE-A as it is orhave a larger system bandwidth (e.g., 100 MHz). Alternatively, one cellmay support a plurality of numerologies. In other words, UEs thatoperate with different numerologies may coexist in one cell.

The numerology corresponds to one subcarrier spacing in a frequencydomain. Different numerologies may be defined by scaling referencesubcarrier spacing to an integer N.

DEFINITION OF TERMS

eLTE eNB: The eLTE eNB is the evolution of eNB that supportsconnectivity to EPC and NGC.

gNB: A node which supports the NR as well as connectivity to NGC.

New RAN: A radio access network which supports either NR or E-UTRA orinterfaces with the NGC.

Network slice: A network slice is a network created by the operatorcustomized to provide an optimized solution for a specific marketscenario which demands specific requirements with end-to-end scope.

Network function: A network function is a logical node within a networkinfrastructure that has well-defined external interfaces andwell-defined functional behavior.

NG-C: A control plane interface used on NG2 reference points between newRAN and NGC.

NG-U: A user plane interface used on NG3 references points between newRAN and NGC.

Non-standalone NR: A deployment configuration where the gNB requires anLTE eNB as an anchor for control plane connectivity to EPC, or requiresan eLTE eNB as an anchor for control plane connectivity to NGC.

Non-standalone E-UTRA: A deployment configuration where the eLTE eNBrequires a gNB as an anchor for control plane connectivity to NGC.

User plane gateway: A termination point of NG-U interface.

Overview of System

FIG. 1 illustrates an example of an overall structure of a NR system towhich a method proposed in the present disclosure is applicable.

Referring to FIG. 1, an NG-RAN consists of gNBs that provide an NG-RAuser plane (new AS sublayer/PDCP/RLC/MAC/PHY) and control plane (RRC)protocol terminations for a user equipment (UE).

The gNBs are interconnected with each other by means of an Xn interface.

The gNBs are also connected to an NGC by means of an NG interface.

More specifically, the gNBs are connected to an access and mobilitymanagement function (AMF) by means of an N2 interface and to a userplane function (UPF) by means of an N3 interface.

New Rat (NR) Numerology and Frame Structure

In the NR system, multiple numerologies may be supported. Thenumerologies may be defined by subcarrier spacing and a CP (CyclicPrefix) overhead. Spacing between the plurality of subcarriers may bederived by scaling basic subcarrier spacing into an integer N (or μ). Inaddition, although a very low subcarrier spacing is assumed not to beused at a very high subcarrier frequency, a numerology to be used may beselected independent of a frequency band.

In addition, in the NR system, a variety of frame structures accordingto the multiple numerologies may be supported.

Hereinafter, an orthogonal frequency division multiplexing (OFDM)numerology and a frame structure, which may be considered in the NRsystem, will be described.

A plurality of OFDM numerologies supported in the NR system may bedefined as in Table 1.

TABLE 1 μ Δf = 2^(μ) · 15[kHz] Cyclic prefix 0 15 Normal 1 30 Normal 260 Normal, Extended 3 120 Normal 4 240 Normal

The NR supports multiple numerologies (or subcarrier spacing (SCS)) forsupporting various 5G services. For example, when the SCS is 15 kHz, awide area in traditional cellular bands is supported and when the SCS is30 kHz/60 kHz, dense-urban, lower latency, and wider carrier bandwidthare supported, and when the SCS is more than 60 kHz, a bandwidth largerthan 24.25 GHz is supported in order to overcome phase noise.

An NR frequency band is defined as frequency ranges of two types (FR1and FR2). FR1 and FR2 may be configured as shown in Table 2 below.Further, FR2 may mean a millimeter wave (mmW).

TABLE 2 Frequency Range Corresponding frequency designation rangeSubcarrier Spacing FR1  410 MHz-7125 MHz 15, 30, 60 kHz FR2 24250MHz-52600 MHz 60, 120, 240 kHz 

Regarding a frame structure in the NR system, a size of various fieldsin the time domain is expressed as a multiple of a time unit ofT_(s)=1/(Δf_(max)·N_(f)). In this case, Δf_(max)=480·10³, andN_(f)=4096. DL and UL transmission is configured as a radio frame havinga section of T_(f)=(Δf_(max)N_(f)/100)·T_(s)=10 ms. The radio frame iscomposed of ten subframes each having a section ofT_(sf)=(Δf_(max)N_(f)/1000)·T_(s)=1 ms. In this case, there may be a setof UL frames and a set of DL frames.

FIG. 2 illustrates a relation between an uplink frame and a downlinkframe in a wireless communication system to which a method proposed inthe present disclosure is applicable.

As illustrated in FIG. 2, uplink frame number i for transmission from auser equipment (UE) shall start T_(TA)=N_(TA)T_(s) before the start of acorresponding downlink frame at the corresponding UE.

Regarding the numerology μ, slots are numbered in increasing order ofn_(s) ^(μ)∈{0, . . . , N_(subframe) ^(slots,μ)−1} within a subframe andare numbered in increasing order of n_(s,f) ^(μ)∈{0, . . . , N_(frame)^(slots,μ)−1} within a radio frame. One slot consists of consecutiveOFDM symbols of N_(symb) ^(μ), and N_(symb) ^(μ) is determined dependingon a numerology used and slot configuration. The start of slots n_(s)^(μ) in a subframe is aligned in time with the start of OFDM symbolsn_(s) ^(μ)N_(symb) ^(μ) in the same subframe.

Not all UEs are able to transmit and receive at the same time, and thismeans that not all OFDM symbols in a downlink slot or an uplink slot areavailable to be used.

Table 3 represents the number N_(symb) ^(slot) of OFDM symbols per slot,the number N_(slot) ^(frame,μ) of slots per radio frame, and the numberN_(slot) ^(subframe,μ) of slots per subframe in a normal CP. Table 4represents the number of OFDM symbols per slot, the number of slots perradio frame, and the number of slots per subframe in an extended CP.

TABLE 3 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

TABLE 4 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)2 12 40 4

FIG. 3 illustrates an example of a frame structure in a NR system. FIG.3 is merely for convenience of explanation and does not limit the scopeof the present disclosure.

In Table 4, in case of μ=2, i.e., as an example in which a subcarrierspacing (SCS) is 60 kHz, one subframe (or frame) may include four slotswith reference to Table 3, and one subframe={1, 2, 4} slots shown inFIG. 3, for example, the number of slot(s) that may be included in onesubframe may be defined as in Table 3.

Further, a mini-slot may consist of 2, 4, or 7 symbols, or may consistof more symbols or less symbols.

In regard to physical resources in the NR system, an antenna port, aresource grid, a resource element, a resource block, a carrier part,etc. May be considered.

Hereinafter, the above physical resources that may be considered in theNR system are described in more detail.

First, in regard to an antenna port, the antenna port is defined so thata channel over which a symbol on an antenna port is conveyed may beinferred from a channel over which another symbol on the same antennaport is conveyed. When large-scale properties of a channel over which asymbol on one antenna port is conveyed may be inferred from a channelover which a symbol on another antenna port is conveyed, the two antennaports may be regarded as being in a quasi co-located or quasico-location (QC/QCL) relation. Here, the large-scale properties mayinclude at least one of delay spread, Doppler spread, frequency shift,average received power, and received timing.

FIG. 4 illustrates an example of a resource grid supported in a wirelesscommunication system to which a method proposed in the presentdisclosure is applicable.

Referring to FIG. 4, a resource grid consists of N_(RB) ^(μ)N_(sc) ^(RB)subcarriers on a frequency domain, each subframe consisting of 14·2μOFDM symbols, but the present disclosure is not limited thereto.

In the NR system, a transmitted signal is described by one or moreresource grids, consisting of N_(RB) ^(μ)N_(sc) ^(RB) subcarriers, and2^(μ)N_(symb) ^((μ)) OFDM symbols, where N_(RB) ^(μ)≤N_(RB) ^(max,μ).N_(RB) ^(max,μ) denotes a maximum transmission bandwidth and may changenot only between numerologies but also between uplink and downlink.

In this case, as illustrated in FIG. 5, one resource grid may beconfigured per numerology μ and antenna port p.

FIG. 5 illustrates examples of a resource grid per antenna port andnumerology to which a method proposed in the present disclosure isapplicable.

Each element of the resource grid for the numerology μ and the antennaport p is called a resource element and is uniquely identified by anindex pair (k,l) where k=0, . . . , N_(RB) ^(μ)N_(sc) ^(RB)−1 is anindex on a frequency domain, and l=0 . . . , 2^(μ)N_(symb) ^((μ))−1refers to a location of a symbol in a subframe. The index pair (k,l) isused to refer to a resource element in a slot, where l=0, . . . ,N_(symb) ^(μ)−1.

The resource element (k,l) for the numerology μ and the antenna port pcorresponds to a complex value a_(k,l) ^((p,μ)). When there is no riskfor confusion or when a specific antenna port or numerology is notspecified, the indices p and μ may be dropped, and as a result, thecomplex value may be a_(k,l) ^((p)) or a_(k,l) .

Further, a physical resource block is defined as N_(sc) ^(RB)=12consecutive subcarriers in the frequency domain.

Point A serves as a common reference point of a resource block grid andmay be obtained as follows.

-   -   offsetToPointA for PCell downlink represents a frequency offset        between the point A and a lowest subcarrier of a lowest resource        block that overlaps a SS/PBCH block used by the UE for initial        cell selection, and is expressed in units of resource blocks        assuming 15 kHz subcarrier spacing for FR1 and 60 kHz subcarrier        spacing for FR2;    -   absoluteFrequencyPointA represents frequency-location of the        point A expressed as in absolute radio-frequency channel number        (ARFCN);

The common resource blocks are numbered from 0 and upwards in thefrequency domain for subcarrier spacing configuration μ.

The center of subcarrier 0 of common resource block 0 for the subcarrierspacing configuration μ coincides with “point A”. A common resourceblock number n_(CRB) ^(μ) in the frequency domain and resource elements(k, l) for the subcarrier spacing configuration μ may be given by thefollowing Equation 1.

$\begin{matrix}{n_{CRB}^{\mu} = \left\lfloor \frac{k}{N_{sc}^{RB}} \right\rfloor} & \left\lbrack {{Equation}1} \right\rbrack\end{matrix}$

Here, k may be defined relative to the point A so that k=0 correspondsto a subcarrier centered around the point A. Physical resource blocksare defined within a bandwidth part (BWP) and are numbered from 0 tosize N_(BWP,i) ^(size)−1, where i is No. Of the BWP. A relation betweenthe physical resource block n_(PRB) in BWP i and the common resourceblock n_(CRB) may be given by the following Equation 2.

n _(CRB) =n _(PRB) +N _(BWP,i) ^(start)  [Equation 2]

Here, N_(BWP,i) ^(start) may be the common resource block where the BWPstarts relative to the common resource block 0.

Bandwidth Part (BWP)

The NR system may support up to 400 MHz per component carrier (CC). If aUE which operates in wideband CC operates while continuously turning onRF for all CCs, UE battery consumption may increase. Alternatively, whenseveral use cases (e.g., eMBB, URLLC, mMTC, V2X, etc.) which operate inone wideband CC are considered, different numerologies (e.g.,sub-carrier spacing) may be supported for each frequency band in thecorresponding CC. Alternatively, a capability for the maximum bandwidthmay vary for each UE. By considering this, the BS may instruct the UE tooperate only in a partial bandwidth rather than the entire bandwidth ofthe wideband CC and intends to define the corresponding partialbandwidth as the bandwidth part (BWP) for convenience. The BWP mayconsist of consecutive resource blocks (RBs) on the frequency axis andmay correspond to one numerology (e.g., sub-carrier spacing, CP length,slot/mini-slot duration).

A base station may configure multiple BWPs even within one CC configuredto the UE. As one example, a BWP occupying a relatively small frequencydomain may be configured in a PDCCH monitoring slot, and a PDSCHindicated in PDCCH may be scheduled onto a BWP larger than this.Alternatively, when UEs are concentrated on a specific BWP, some UEs maybe configured with other BWPs for load balancing. Alternatively,considering frequency domain inter-cell interference cancellationbetween neighboring cells, a partial spectrum of the entire bandwidthmay be excluded and both BWPs may be configured even in the same slot.That is, the base station may configure at least one DL/UL BWP to the UEassociated with the wideband CC and may activate at least one DL/UL BWP(by L1 signaling or MAC CE or RRC signaling) among configured DL/ULBWP(s) at a specific time, and switching may be indicated to anotherconfigured DL/UL BWP (by L1 signaling or MAC CE or RRC signaling) or atimer value may be switched to the fixed DL/UL BWP when a timer value isexpired based on a timer. In this case, the activated DL/UL BWP isdefined as an active DL/UL BWP. However, in a situation in which the UEis in an initial access process or before RRC connection is set up, theUE may not receive a configuration for the DL/UL BWP and in such asituation, the DL/UL BWP assumed by the UE is defined as an initialactive DL/UL BWP.

Physical Channel and General Signal Transmission

FIG. 6 illustrates physical channels and general signal transmission. Ina wireless communication system, the UE receives information from theeNB through Downlink (DL) and the UE transmits information from the eNBthrough Uplink (UL). The information which the eNB and the UE transmitand receive includes data and various control information and there arevarious physical channels according to a type/use of the informationwhich the eNB and the UE transmit and receive.

When the UE is powered on or newly enters a cell, the UE performs aninitial cell search operation such as synchronizing with the eNB (S601).To this end, the UE may receive a Primary Synchronization Signal (PSS)and a (Secondary Synchronization Signal (SSS) from the eNB andsynchronize with the eNB and acquire information such as a cell ID orthe like. Thereafter, the UE may receive a Physical Broadcast Channel(PBCH) from the eNB and acquire in-cell broadcast information.Meanwhile, the UE receives a Downlink Reference Signal (DL RS) in aninitial cell search step to check a downlink channel status.

A UE that completes the initial cell search receives a Physical DownlinkControl Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH)according to information loaded on the PDCCH to acquire more specificsystem information (S602).

Meanwhile, when there is no radio resource first accessing the eNB orfor signal transmission, the UE may perform a Random Access Procedure(RACH) to the eNB (S603 to S606). To this end, the UE may transmit aspecific sequence to a preamble through a Physical Random Access Channel(PRACH) (S603 and S605) and receive a response message (Random AccessResponse (RAR) message) for the preamble through the PDCCH and acorresponding PDSCH. In the case of a contention based RACH, aContention Resolution Procedure may be additionally performed (S606).

The UE that performs the above procedure may then perform PDCCH/PDSCHreception (S607) and Physical Uplink Shared Channel (PUSCH)/PhysicalUplink Control Channel (PUCCH) transmission (S608) as a generaluplink/downlink signal transmission procedure. In particular, the UE mayreceive Downlink Control Information (DCI) through the PDCCH. Here, theDCI may include control information such as resource allocationinformation for the UE and formats may be differently applied accordingto a use purpose.

For example, in an NR system, DCI format 0_0 and DCI format 0_1 are usedfor scheduling of PUSCH in one cell, and DCI format 1_0 and DCI format1_1 are used for scheduling PDSCH in one cell. Information included inDCI format 0_0 is CRC scrambled by C-RNTI or CS-RNTI or MCS-C-RNTI andtransmitted. And, DCI format 0_1 is used for reserving PUSCH in onecell. Information included in DCI format 0_1 may be CRC scrambled byC-RNTI or CS-RNTI or SP-CSI-RNTI or MCS-C-RNTI and transmitted. DCIformat 1_0 is used for scheduling PDSCH in one DL cell. Informationincluded in DCI format 1_0 is CRC scrambled by C-RNTI or CS-RNTI orMCS-C-RNTI and transmitted. DCI format 1_1 is used for scheduling PDSCHin one cell. Information included in DCI format 1_1 is CRC scrambled byC-RNTI or CS-RNTI or MCS-C-RNTI and transmitted. DCI format 2_1 is usedto inform PRB(s) and OFDM symbol(s) that the UE may assume thattransmission is not intended. The following information included in DCIformat 2_1 such as preemption indication 1, preemption indication 2, . .. , preemption indication N is CRC scrambled by INT-RNTI andtransmitted.

Meanwhile, the control information which the UE transmits to the eNBthrough the uplink or the UE receives from the eNB may include adownlink/uplink ACK/NACK signal, a Channel Quality Indicator (CQI), aPrecoding Matrix Index (PMI), a Rank Indicator (RI), and the like. TheUE may transmit the control information such as the CQI/PMI/RI, etc.,via the PUSCH and/or PUCCH.

DL and UL Transmission/Reception Operation

Downlink Transmission/Reception Operation

FIG. 7 illustrates an example of a downlink transmission and receptionoperation.

Referring to FIG. 7, the eNB may schedule downlink transmission such asthe frequency/time resource, the transport layer, a downlink precoder,the MCS, etc., (S701). Specifically, the eNB may determine a beam forPDSCH transmission to the UE. In addition, the UE may receive DownlinkControl Information (DCI) for downlink scheduling (i.e., includingscheduling information of the PDSCH) on the PDCCH (S702). DCI format 1_0or DCI format 1_1 may be used for the downlink scheduling andspecifically, DCI format 1_1 may include information such as thefollowing examples: Identifier for DCI formats, Bandwidth partindicator, Frequency domain resource assignment, Time domain resourceassignment, PRB bundling size indicator, Rate matching indicator, ZPCSI-RS trigger, Antenna port(s), Transmission configuration indication(TCI), SRS request, Demodulation Reference Signal (DMRS) sequenceinitialization, Modulation and Coding Scheme (MCS), New data indicator,Redundancy Version), HARQ process number and Downlink assignment index.

In the case of 2-codeword transmission (e.g.,maxNrofCodeWordsScheduledByDCI=2), an MCS/NI/RV field may be configuredfor each of TB 1 and TB 2.

In particular, according to each state/index indicated in an antennaport(s) field, the number of DMRS ports may be scheduled, andsingle-user (SU)/Multi-user (MU) transmission scheduling is alsoavailable. Specifically, each of a table/rule for an antenna port(s)field value based on ‘dmrs-Type’ and ‘maxLength’ may be defined. Numberof DMRS CDM group without data/DMRS port(s)/Number of front-load symbolscorresponding to one CW/ two CW may be determined according to theantenna port(s) field value. In addition, the TCI field consists of 3bits, and the QCL for the DMRS may be dynamically indicated byindicating a maximum of 8 TCI states according to the TCI field value.The UE may receive downlink data from the base station on the PDSCH(S703). When the UE detects a PDCCH including DCI format 1_0 or 1_1, theUE may decode the PDSCH according to an indication by the correspondingDCI.

Here, when the UE receives a PDSCH scheduled by DCI format 1_1, a DMRSconfiguration type may be configured by higher layer parameter“dmrs-Type” in the UE and the DMRS configuration type is used forreceiving the PDSCH. Further, in the UE, the maximum number offront-loaded DMRS symbols for the PDSCH may be configured by higherlayer parameter “maxLength.”

In the case of DMRS configuration type 1, when a single codeword isscheduled and an antenna port mapped to an index of {2, 9, 10, 11, or30} is designated in the UE or when two codewords are scheduled in theUE, the UE assumes that all remaining orthogonal antenna ports are notassociated with PDSCH transmission to another UE. Alternatively, in thecase of DMRS configuration type 2, when a single codeword is scheduledand an antenna port mapped to an index of {2, 10, or 23} is designatedin the UE or when two codewords are scheduled in the UE, the UE assumesthat all remaining orthogonal antenna ports are not related to PDSCHtransmission to another UE.

When the UE receives the PDSCH, a precoding granularity P′ may beassumed as a consecutive resource block in the frequency domain. Here,P′ may correspond to one value of {2, 4, and wideband}. When P′ isdetermined as wideband, the UE does not predict that the PDSCH isscheduled to non-contiguous PRBs and the UE may assume that the sameprecoding is applied to the allocated resource. On the contrary, when P′is determined as any one of {2 and 4}, a Precoding Resource Block (PRG)is split into P′ consecutive PRBs. The number of actually consecutivePRBs in each PRG may be one or more. The UE may assume that the sameprecoding is applied to consecutive downlink PRBs in the PRG.

In order to determine a modulation order in the PDSCH, a target coderate, and a transport block size, the UE may first read a 5-bit MCDfield in the DCI and determine the modulation order and the target coderate. In addition, the UE may read a redundancy version field in the DCIand determine a redundancy version. In addition, the UE may determinethe transport block size by using the number of layers before ratematching and the total number of allocated PRBs.

A transport block may be made up of one or more code block groups (CBG),and one CBG may be made up of one or more code blocks (CB). Also, in anNR system, data transmission and reception may be performed for eachCB/CBG as well as for each transport block. Accordingly, ACK/NACKtransmission and retransmission per CB/CBG also may be possible. The UEmay receive information on CB/CBG from the base station through a DCI(e.g., DCI format 0_1 and DCI format 1_1). Also, the UE may receiveinformation on a data transmission unit (e.g., TB/CB/CBG) from the basestation.

Meanwhile, mapping a codeword, a layer, and an antenna port for thePDSCH is as follows. Modulated symbols d^((q))(0), . . . ,d^((q))(M_(symb) ^((q))−1) of a complex value for a codeword (CW) q aremapped to layers x(i)=[x⁽⁰⁾(1) . . . x^((y-1))(1)]^(z), i=0, 1, . . . ,M_(symb) ^(layer)−1, and the layers x(i) are mapped to antenna portsaccording to Equation 3. Here, v represents the number of layers, andM_(symb) ^(layer) represents the number of modulated symbols per layer.

$\begin{matrix}{\begin{bmatrix}{y^{(p_{0})}(i)} \\ \vdots \\{y^{(p_{v - 1})}(i)}\end{bmatrix} = \begin{bmatrix}{x^{(0)}(i)} \\ \vdots \\{x^{({v - 1})}(i)}\end{bmatrix}} & \left\lbrack {{Equation}3} \right\rbrack\end{matrix}$

where,

A set {p₀, . . . , p_(v-1)} of the antenna ports may be determinedaccording to a procedure of [4, TS 38.212]. That is, the antenna portsmay be sequentially mapped to the layers in the order of DMRS portsindicated to the UE through DMRS table.

UL Transmission/Reception Operation

FIG. 8 illustrates an example of an uplink transmission and receptionoperation.

Referring to the FIG. 8, the eNB may schedule uplink transmission suchas the frequency/time resource, the transport layer, an uplink precoder,the MCS, etc., (S801). In particular, the eNB may determine a beam forPUSCH transmission of the UE through the beam management operationsdescribed above. And, the UE may receive, from the eNB, DCI for uplinkscheduling (i.e., including scheduling information of the PUSCH) on thePDCCH (S802). DCI format 0_0 or 0_1 may be used for the uplinkscheduling and in particular, DCI format 0_1 may include informationsuch as the following examples: Identifier for DCI formats,UL/Supplementary uplink (SUL) indicator, Bandwidth part indicator,Frequency domain resource assignment, Time domain resource assignment,Frequency hopping flag, Modulation and coding scheme (MCS), SRS resourceindicator (SRI), Precoding information and number of layers, Antennaport(s), SRS request, DMRS sequence initialization, and Uplink SharedChannel (UL-SCH) indicator.

In particular, configured SRS resources in an SRS resource setassociated with higher layer parameter “usage” may be indicated by anSRS resource indicator field. Further, “spatialRelationInfo” may beconfigured for each SRS resource and a value of “spatialRelationInfo”may be one of {CRI, SSB, and SRI}.

In addition, the UE may transmit the uplink data to the eNB on the PUSCH(S803). When the UE detects a PDCCH including DCI format 0_0 or 0_1, theUE may transmit the corresponding PUSCH according to the indication bythe corresponding DCI. two schemes (Codebook based transmission schemeand non-codebook based transmission scheme) are supported for PUSCHtransmission.

In the case of the codebook based transmission, when higher layerparameter txConfig” is set to “codebook”, the UE is configured to thecodebook based transmission. On the contrary, when higher layerparameter txConfig” is set to “nonCodebook”, the UE is configured to thenon-codebook based transmission. When higher layer parameter “txConfig”is not configured, the UE does not predict that the PUSCH is scheduledby DCI format 0_1. When the PUSCH is scheduled by DCI format 0_0, thePUSCH transmission is based on a single antenna port. In the case of thecodebook based transmission, the PUSCH may be scheduled by DCI format0_0, DCI format 0_1, or semi-statically. When the PUSCH is scheduled byDCI format 0_1, the UE determines a PUSCH transmission precoder based onthe SRI, the Transmit Precoding Matrix Indicator (TPMI), and thetransmission rank from the DCI as given by the SRS resource indicatorand the Precoding information and number of layers field. The TPMI isused for indicating a precoder to be applied over the antenna port andwhen multiple SRS resources are configured, the TPMI corresponds to theSRS resource selected by the SRI. Alternatively, when the single SRSresource is configured, the TPMI is used for indicating the precoder tobe applied over the antenna port and corresponds to the correspondingsingle SRS resource. A transmission precoder is selected from an uplinkcodebook having the same antenna port number as higher layer parameter“nrofSRS-Ports”. When the UE is set to higher layer parameter “txConfig”set to “codebook”, at least one SRS resource is configured in the UE. AnSRI indicated in slot n is associated with most recent transmission ofthe SRS resource identified by the SRI and here, the SRS resourceprecedes PDCCH (i.e., slot n) carrying the SRI.

In the case of the non-codebook based transmission, the PUSCH may bescheduled by DCI format 0_0, DCI format 0_1, or semi-statically. Whenmultiple SRS resources are configured, the UE may determine the PUSCHprecoder and the transmission rank based on a wideband SRI and here, theSRI is given by the SRS resource indicator in the DCI or given by higherlayer parameter “srs-ResourceIndicator”. The UE may use one or multipleSRS resources for SRS transmission and here, the number of SRS resourcesmay be configured for simultaneous transmission in the same RB based onthe UE capability. Only one SRS port is configured for each SRSresource. Only one SRS resource may be configured to higher layerparameter “usage” set to “nonCodebook”. The maximum number of SRSresources which may be configured for non-codebook based uplinktransmission is 4. The SRI indicated in slot n is associated with mostrecent transmission of the SRS resource identified by the SRI and here,the SRS transmission precedes PDCCH (i.e., slot n) carrying the SRI.

Demodulation Reference Signal (DMRS)

A DMRS related operation for receiving the PDSCH will be described.

When the PDSCH scheduled by DCI format 1_0 or when the PDSCH is receivedbefore configuring a random dedicated higher layer amongdmrs-AdditionalPosition, maxLength, and dmrs-Type parameters, the UEassumes that there is no PDSCH in a random symbol carrying a DM-RSexcept for a PDSCH having allocation duration of two symbols havingPDSCH mapping type B, a single symbol front-loaded DM-RS ofconfiguration type 1 is transmitted on the DM-RS port 100, and allremaining orthogonal antenna ports are not related to transmission ofthe PDSCH to the other UE.

Additionally, for a PDSCH having mapping type A, the UE assumes thatdmrs-AdditionalPosition=‘pos2’ and there are up to two additionalsingle-symbol DMRSs in a slot according to PDSCH duration indicated bythe DCI. With respect to a PDSCH having allocation duration of 7 symbolsfor a normal CP having mapping type B or 6 symbols for an extended CP,when the front-loaded DMRS symbol is present in each of 1st and 2ndsymbols of the PDSCH allocation duration, the assumes that oneadditional single symbol DMRS is present in a 5th or 6th symbol.Otherwise, the UE assumes that there is no additional DMRS symbol. Inaddition, for a PDSCH having allocation duration of 4 symbols havingmapping type B, the UE assumes that an additional DM-RS is present nolonger and for a PDSCH having allocation duration of 2 symbols havingmapping type B, the UE assumes that the additional DM-RS is not presentand the UE assumes that the PDSCH is present in a symbol for carryingthe DM-RS.

FIG. 9 is a flowchart illustrating an example of a DL DMRS procedure.

-   -   The BS transmits, to the UE, DMRS configuration information        (S910).

The DMRS configuration information may refer to DMRS-DownlinkConfig IE.The DMRS-DownlinkConfig IE may include parameter dmrs-Type, parameterdmrs-AdditionalPosition, parameter maxLength, parameter phaseTrackingRS,etc.

The dmrs-Type parameter is a parameter for selecting DMRS configurationtype to be used for DL. In the NR, the DMRS may be divided into twoconfiguration types of (1) DMRS configuration type 1 and (2) DMRSconfiguration type 2. DMRS configuration type 1 is a type having ahigher RS density in the frequency domain and DMRS configuration type 2is a type having more DMRS antenna ports.

The parameter dmrs-AdditionalPosition is a parameter representing aposition of additional DMRS in DL. When the corresponding parameter isnot present, the UE applies a value of pos2. In respect to the DMRS, afirst position of the front-loaded DRMS may be determined according to aPDSCH mapping type (type A or type B) and additional DRMS may beconfigured in order to support a high speed UE. The front-loaded DMRSoccupies 1 or 2 continuous OFDM symbols and is indicated by RRCsignaling and downlink control information (DCI).

The parameter maxLength is a parameter representing the maximum numberof OFDM symbols for the DL front-loaded DMRS. The parameterphaseTrackingRS is parameter for configuring DL PTRS. When thecorresponding parameter is not preset or is cancelled, the UE assumesthat there is no DL PATRS.

-   -   The BS generates a sequence used for the DMRS (S920).

The sequence for the DMRS is generated according to Equation 4 below.

$\begin{matrix}{{r(n)} = {{\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {2n} \right)}}} \right)} + {j\frac{1}{\sqrt{2}}\left( {1 - {2 \cdot {c\left( {{2n} + 1} \right)}}} \right)}}} & \left\lbrack {{Equation}4} \right\rbrack\end{matrix}$

The pseudo-random sequence c(i) is defined in 3gpp TS 38.211 5.2.1. Thatis, c(i) may be a length 31 gold sequence using 2 m-sequences. Apseudo-random sequence generator is initialized by Equation 5 below.

c _(init)=(2¹⁷(N _(symb) ^(slot) n _(s,f) ^(μ) +l+1)(2N _(ID) ^(n)^(SCID) +1)+2N _(ID) ^(n) ^(SCID) +n _(SCID))mod 2³¹  [Equation 5]

Here, l represents a number of the OFDM symbol in the slot and n_(s,f)^(μ) represents a slot number in the frame.

In addition, if N_(ID) ⁰, N_(ID) ¹∈{0, 1, . . . , 65535} is provided andthe PDSCH is scheduled by PDCCH using DCI format 1_1 having CRCscrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI, N_(ID) ⁰, N_(ID) ¹∈{0, 1, .. . , 65535} is given by each of higher-layer parameter scramblingID0and scramblingID1 in DMRS-DownlinkConfig IE.

-   -   If N_(ID) ⁰∈{0, 1, . . . , 65535} is provided and the PDSCH is        scheduled by PDCCH using DCI format 1_0 having CRC scrambled by        C-RNTI, MCS-C-RNTI, or CS-RNTI, N_(ID) ⁰∈{0, 1, . . . , 65535}        is given by higher-layer parameter scramblingID0 in        DMRS-DownlinkConfig IE.    -   N_(ID) ^(n) ^(SCID) =N_(ID) ^(cell), otherwise, when DCI format        1_1 is used, quantity is given by a DMRS sequence initialization        field in the DCI related to PDSCH transmission.    -   The BS maps the generated sequence to a resource element (S930).        Here, the resource element may include at least one of a time, a        frequency, an antenna port, or a code.

A location l0 of a first DMRS symbol and a reference point I may bedetermined according to a mapping type. In Mapping type A, the DMRSlocation may be fixed to a third location (pos 2) or a fourth location(pos 3), and a start symbol of the PDSCH may be 0 to 3. A PDSCH lengthmay be 3 to 14 in the case of a normal CP and 3 to 12 in the case of anextended CP. A DMRS symbol may start in a second or third symbolregardless of a start and a length of the PDSCH and this means that acase where a start symbol of the PDSCH is larger than 3 may not beapplied. Mapping type A is used for slot based scheduling. Meanwhile, inMapping type B, the DMRS location is fixed to a first symbol of theallocated PDSCH. The start symbol of the PDSCH may be 0 to 12 in thecase of the normal CP and 0 to 10 in the case of the extended CP. ThePDSCH length may be 2, 4, or 7 symbols in the case of the normal CP and2, 4, or 6 symbols in the case of the extended CP. The DMRS symbol maystart in the first PDSCH symbol regardless of the PDSCH start. Mappingtype B may be used for mini-slot based scheduling.

-   -   The BS transmits, to the UE, the DMRS on the resource element        (S940). The UE receives the PDSCH by using the received DMRS.

UE DM-RS Transmission Procedure

A DMRS related operation for receiving the PUSCH will be described. Asdescribed above, UL means signal transmission (or communication) fromthe UE to the BS. A UL DMRS related operation is similar to the DL DMRSrelated operation described above, and names of the parameters relatedto DL may be replaced with the names of parameters related to UL.

That is, DMRS-DownlinkConfig IE may be replaced with DMRS-UplinkConfigIE, PDSCH mapping type may be replaced with PUSCH mapping type, and thePDSCH may be replaced with the PUSCH. In addition, in the DL DMRSrelated operation, the BS may be replaced with the UE and the UE may bereplaced with the BS. Sequence generation for the UL DMRS may be defineddifferently according to whether transform precoding is enabled.

Hereinafter, the UE DM-RS transmission procedure will be described inmore detail.

When the transmitted PUSCH is not scheduled by DCI format 0_1 having CRCscrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI and does not correspond to aconfigured grant, the UE uses a single symbol front-loaded DMRS ofconfiguration type 1 in DMRS port 0 and does not use the remaining REseven in any PUSCH transmission other than a PUSCH having allocationduration of two OFDM symbols or less having disabled transformprecoding. Additional DM-RS may be transmitted according to a schedulingtype and PUSCH duration by considering whether frequency hopping isenabled.

When the frequency hopping is disabled, the UE assumes thatdmrs-AdditionalPosition is equal to ‘pos2’, and up to 1 additionalDM-RSs may be transmitted according to the PUSCH duration. When thefrequency hopping is enabled, the UE assumes thatdmrs-AdditionalPosition is equal to ‘pos1’, and up to 1 additional DM-RSmay be transmitted according to the PUSCH duration.

When the transmitted PUSCH is scheduled by activation DCI format 0_0having CRC scrambled by CS-RNTI, the UE uses a single symbolfront-loaded DMRS of a configuration type provided by a higher layerparameter dmrs-Type of configuredGrantConfig on DMRS port 0 and does notuse remaining REs which are not used for the DMRS in the symbols evenfor any PUSCH transmission other than the PUSCH having the allocationduration of two OFDM symbols or less having the disabled transformprecoding, and an additional DMRS having dmrs-AdditionalPosition fromconfiguredGrantConfig may be transmitted based on a scheduling type andPUSCH duration by considering whether the frequency hopping is enabled.

When the transmitted PUSCH is scheduled by DCI format 0_1 having CRCscrambled by C-RNTI, CS-RNTI, or MCS-RNTI or corresponds to theconfigured grant,

-   -   the UE may be configured as the higher layer parameter drms-Type        in DMRS-UplinkConfig and the configured DM-RS configuration type        is used for transmitting the PDSCH.    -   The UE may be configured as a maximum number of front-loaded        DMRS symbols for the PUSCH by the higher layer parameter        maxLength given by DMRS-UplinkConfig.

When the UE transmitting the PUSCH is configured as higher layerparameter phaseTrackingRS in DMRS-UplinkConfig, the UE may assume thatthe configurations do not simultaneously occur for the transmittedPUSCH.

-   -   Each random DM-RS port of 4-7 or 6-11 is scheduled by the UE for        DM-RS configuration type 1 and type 2 and the PT-RS is        transmitted from the UE.

For the PUSCH scheduled by DCI format 0_1, by activation DCI format 0_1having the CRC scrambled by the CS-RNTI or by configured grant type 1configuration, the UE assumes that a DM-RS CDM group is not used fordata transmission.

Quasi-Co Location (QCL)

The antenna port is defined so that a channel over which a symbol on anantenna port is conveyed may be inferred from a channel over whichanother symbol on the same antenna port is conveyed. When properties ofa channel over which a symbol on one antenna port is conveyed may beinferred from a channel over which a symbol on another antenna port isconveyed, the two antenna ports may be considered as being in a quasico-located or quasi co-location (QC/QCL) relationship.

The channel properties include one or more of delay spread, Dopplerspread, frequency/Doppler shift, average received power, receivedtiming/average delay, and spatial RX parameter. The spatial Rx parametermeans a spatial (reception) channel property parameter such as an angleof arrival.

The UE may be configured with a list of up to M TCI-State configurationswithin the higher layer parameter PDSCH-Config to decode PDSCH accordingto a detected PDCCH with DCI intended for the corresponding UE and agiven serving cell, where M depends on UE capability (e.g.maxNumberActiveTCI-PerBWP).

Each TCI-State contains parameters for configuring a quasi co-locationrelationship between one or two DL reference signals and the DM-RS portsof the PDSCH.

The quasi co-location relationship is configured by the higher layerparameter qcl-Type1 for the first DL RS and qcl-Type2 for the second DLRS (if configured). For the case of two DL RSs, the QCL types are not bethe same, regardless of whether the references are to the same DL RS ordifferent DL RSs.

The quasi co-location types corresponding to each DL RS are given by thehigher layer parameter qcl-Type of QCL-Info and may take one of thefollowing values:

-   -   ‘QCL-TypeA’: {Doppler shift, Doppler spread, average delay,        delay spread}    -   ‘QCL-TypeB’: {Doppler shift, Doppler spread}    -   ‘QCL-TypeC’: {Doppler shift, average delay}    -   ‘QCL-TypeD’: {Spatial Rx parameter}

For example, if a target antenna port is a specific NZP CSI-RS, thecorresponding NZP CSI-RS antenna ports may be indicated/configured to beQCLed with a specific TRS in terms of QCL-TypeA and with a specific SSBin terms of QCL-TypeD. The UE receiving the indication/configuration mayreceive the corresponding NZP CSI-RS using the Doppler or delay valuemeasured in the QCL-TypeA TRS and apply the Rx beam used for QCL-TypeDSSB reception to the reception of the corresponding NZP CSI-RSreception.

The UE may receive an activation command by MAC CE signaling used to mapup to eight TCI states to the codepoint of the DCI field ‘TransmissionConfiguration Indication’.

The standard content related to the above-described QCL may be the sameTable 5 below (e.g. see 3gpp TS 38.214. section 5.1.5.).

TABLE 5  When the HARQ-ACK corresponding to the PDSCH carrying theactivation command is transmitted in slot n, the indicated mappingbetween TCI states and codepoints of the DCI field ‘TransmissionConfiguration indication’ should be applied starting from slot n +3N_(slot) ^(subframe, μ) + 1. After a UE receives an initial higherlayer configuration of TCI states and before reception of the activationcommand, the UE may assume that the DM-RS ports of PDSCH of a servingcell are quasi co-located with the SS/PDCH block determined in theinitial access procedure with repect to ‘QCL-TypeA’, and whenapplicable, also with respect to‘QCL-TypeD’.  If a UE is configured withthe higher layer parameter tci-PresentInDCI that is set as ‘enabled’ forthe CORESET scheduling the PDSCH, the UE assumes that the TCI field ispresent in the DCI format 1_1 of the PDCCH transmitted on the CORESET.If tci-PresentInDCI is not configured for the CORESET scheduling thePDSCH or the PDSCH is scheduled by a DCI format 1_0, and the time offsetbetween the reception of the DL DCI and the corresponding PDSCH is equalto or greater than a threshold timeDurationForQCL, where the thresholdis based on reported UE capability [13, TS 38.306], for determiningPDSCH antenna port quasi co-location, the UE assumes that the TCI stateor the QCL assumption for the PDSCH is identical to the TCI state or QCLassumption whichever is applied for the CORESET used for the PDCCHtransmission.  If the tci-PresentInDCI is set as ‘enabled’, the TCIfield in DCI in the scheduling component carrier points to the activatedTCI states in the scheduled component carrier or DL BWP and when thePDSCH is scheduled by DCI format 1_1, the UE shall use the TCI-Stateaccording to the value of the ‘Transmission Configuration Indication’field in the detected PDCCH with DCI for determining PDSCH antenna portquasi co-location. The UE may assume that the DM-RS ports of PDSCH of aserving cell are quasi co-located with the RS(s) in the TCI state withrespect to the QCL type parameter(s) given by the indicated TCI state ifthe time offset between the reception of the DL DCI and thecorresponding PDSCH is equal to or greater than a thresholdtimeDurationForQCL, where the threshold is based on reported UEcapability [13, TS 38.306]. When the UE is configured with a single slotPDSCH, the indicated TCI state should be based on the activated TCIstates in the slot with the scheduled PDSCH. When the UE is configuredwith a multi-slot PDSCH, the idicated TCI state should be based on theactivated TCI states in the first slot with the scheduled PDSCH, and UEshall expect the activated TCI states are the same across the slots withthe scheduled PDSCH. When the UE is configured with CORESET associatedwith a search space set for cross- carrier scheduling, the UE expectstci-PresentInDci is set as ‘enabled’ for the CORESET, and if one or moreof the TCI states configured for the serving cell scheduled by thesearch space set contains ‘QCL-TypeD’, the UE expects the time offsetbetween the reception of the detected PDCCH in the search space set andthe corresponding PDSCH is larger than or equal to the thresholdtimeDurationForQCL.  For both the cases when tci-PresentInDCI is set to‘enabled’ and tci-PresentInDCI is not configured in RRC connected mode,if the offset between the reception of the DL DCI and the correspondingPDSCH is less than the threshold timeDurationForQCL, the UE may assumethat the DM-RS ports of PDSCH of a serving cell are quasi co-locatedwith the RS(s) with respect to the QCL parameter(s) used for PDCCH quasico- location indication of the CORESET associated with a monitoredsearch space with the lowest CORESET-ID in the latest slot in which oneor more CORESETs within the active BWP of the serving cell are monitoredby the UE. In this case, if the ‘QCL-TypeD’ of the PDSCH DM-RS isdifferent from that of the PDCCH DM- RS with which they overlap in atleast one symbol, the UE is expected to prioritize the reception ofPDCCH associated with the CORESET. This also applies to the intra-bandCA case (when PDSCH and the CORESET are in different componentcarriers). If none of configured TCI states contains ‘QCL-TypeD’, the UEshall obtain the other QCL assumptions from the indicated TCI states forits scheduled PDSCH irrespective of the time offset between thereception of the DL DCI and the corresponding PDSCH.

In relation to the beam indication, the UE may be RRC-configured with alist for up to M candidate Transmission Configuration Indication (TCI)states for the purpose of at least Quasi Co-location (QCL) indication,where M may be 64.

Each TCI state may be configured in one RS set. IDs of each DL RS forthe purpose of spatial QCL (QCL Type D) at least in the RS set may referto one of DL RS types such as SSB, P-CSI RS, SP-CSI RS, and A-CSI RS.Initialization/update for the ID of DL RS(s) in the RS set that are usedat least for the purpose of spatial QCL may be performed at least byexplicit signaling.

The TCI-State IE associates one or two DL reference signals (RS) with acorresponding quasi co-location (QCL) type. The TCI-State IE may includeparameters such as bwp-Id/reference signal/QCL type.

A bwp-Id parameter indicates DL BWP where RS is positioned, a cellparameter indicates a carrier where RS is positioned, a reference signalparameter indicates a reference antenna port(s) that is a source ofquasi co-location for a corresponding target antenna port(s), or areference signal including it. The target antenna port(s) may be CSI-RS,PDCCH DMRS, or PDSCH DMRS. For example, a corresponding TCI state ID maybe indicated to NZP CSI-RS resource configuration information toindicate QCL reference RS information for NZP CSI-RS. As anotherexample, a TCI state ID may be indicated in each CORESET configurationto indicate QCL reference information for the PDCCH DMRS antennaport(s). As another example, a TCI state ID may be indicated through DCIto indicate QCL reference information for the PDSCH DMRS antennaport(s).

The descriptions (e.g., 3GPP system, frame structure, DL and ULtransmission and reception, etc.) given above may be applied/used incombination with methods and/or embodiments proposed in the presentdisclosure or may be supplemented to clarify technical features of themethods proposed in the present disclosure. In the present disclosure,the presence of a slash “/” may indicate that all or only some of wordsor phrases separated by/are included.

Multiple Transmission and Reception Point (TRP)-Related Operation

The coordinated multi point (CoMP) technique is a scheme in a pluralityof base stations exchange (e.g., use X2 interface) or utilize channelinformation (e.g., RI/CQI/PMI/LI, etc.) fed back from the user equipment(UE) to perform cooperative transmission with the UE, therebyeffectively controlling interference. According to the scheme used, thecooperative transmission may be divided into joint transmission (JT),coordinated scheduling (CS), coordinated beamforming (CB), dynamic pointselection (DPS), dynamic point blacking (DPB), and the like.

Non-coherent joint transmission (NCJT) may refer to cooperativetransmission that does not consider interference (that is, with nointerference). For example, the NCJT may be a scheme in which a basestation(s) transmits data to one UE through multiple TRPs by using thesame time resource and frequency resource. In this scheme, the multipleTRPs of the base station(s) may be configured to transmit data to UEthrough different layers by using different demodulation referencesignal (DMRS) ports. In other words, the NCJT may correspond to atransmission scheme in which transmission of a MIMO layer(s) from two ormore TRPs is performed without adaptive precoding between the TRPs.

The NCJT may be categorized into fully overlapped NCJT, in which timeand frequency resources used for transmission by each base station (orTRP) are fully overlapped, and partially overlapped NCJT, in which timeand frequency resources used for transmission by each base station (orTRP) are partially overlapped. This is only for convenience ofexplanation in the present disclosure, and it is needless to say that,in the embodiments and methods to be described below, theabove-mentioned terms can be replaced with other terms with the sametechnical meanings. For example, in the case of partially overlappedNCJT, both data of a first base station (e.g., TRP 1) and data of asecond base station (e.g., TRP 2) may be transmitted in some of the timeresources and/or frequency resources, and data of only one of the firstand second base stations may be transmitted in the remaining timeresources and/or frequency resources.

TRP transmits data scheduling information to an NCJT receiving UE as DCI(Downlink Control Information). From the perspective of downlink controlinformation (DCI) transmission, M-TRP (multiple TRP) transmission may bedivided into i) M-DCI (multiple DCI) based M-TRP transmission in whicheach TRP transmits a different DCI and ii) S-DCI (single DCI) basedM-TRP transmission in which one TRP transmits DCI.

Firstly, the single DCI based MTRP scheme will be described. In thesingle DCI based MTRP scheme in which a representative TRP transmitsscheduling information for data transmitted by itself and datatransmitted by another TRP through one DCI, MTRPs cooperatively transmitone common PDSCH and each TRP participating in the cooperativetransmission spatially divides the corresponding PDSCH into differentlayers (i.e., different DMRS ports). In other words, MTRPs transmit onePDSCH but each TRP transmits only some of multiple layers of the PDSCH.For example, when 4-layer data is transmitted, TRP 1 transmits 2 layers,and TRP 2 transmits the remaining 2 layers to the UE.

In this case, scheduling information for the PDSCH is indicated to theUE through one DCI, and the corresponding DCI indicates which DMRS portuses information of which QCL RS and QCL type (which is different fromconventionally indicating the QCL RS and TYPE that are commonly appliedto all DMRS ports indicated by the DCI). That is, M TCI states (M=2 for2 TRP cooperative transmission) are indicated through the TCI field inthe DCI, and the QCL RS and type are identified by using M TCI stateswhich are different for M DMRS port groups. Also, DMRS port informationmay be indicated by using a new DMRS table.

As an example, in the case of the S-DCI, since all schedulinginformation for data transmitted by M TRPs should be delivered throughone DCI, the S-DCI may be used in an ideal backhaul (BH) environment inwhich two TRPs may be dynamically coordinated with each other.

Secondly, the multiple DCI based MTRP method will be described. MTRPstransmit different DCIs and PDSCHs, respectively (the UE receives N DCIsand N PDSCHs from N TRPs), and the corresponding PDSCHs are transmittedby (partially or wholly) overlapping on different time resources. Thecorresponding PDSCHs are transmitted through different scrambling IDs,and the corresponding DCIs may be transmitted through Coresets belongingto different Coreset groups (A coreset group may be identified as anindex defined in the coreset configuration of each Coreset. For example,if Coresets 1 and 2 are set to index=0 and Coresets 3 and 4 are set toindex=1, Coresets 1 and 2 belong to Coreset group 0 and Coresets 3 and 4belong to Coreset group 1. If no index is defined for a coreset, thismay be interpreted as index=0). If multiple scrambling IDs are set inone serving cell or two or more coreset groups are set, the UE may knowthat data is received by multiple DCI-based MTRP operation.

For example, the single DCI based MTRP scheme or the multiple DCI basedMTRP scheme may be indicated to the UE via separate signaling. As anexample, when a plurality of CRS patterns are indicated to the UE forMTRP operation for one serving cell, PDSCH rate matching for CRS may bedifferent depending on this MTRP operation is a single DCI based MTRPoperation or a multiple DCI based MTRP operation.

The base station described in this disclosure may be a generic term foran object that transmits/receives data to and from UE. For example, thebase station described herein may be a concept including one or moretransmission points (TPs), one or more transmission and reception points(TRPs), and the like. For example, multiple TPs and/or multiple TRPsdescribed herein may be included in one base station or included inmultiple base stations. In addition, the TP and/or TRP may include apanel of a base station, a transmission and reception unit, and thelike.

In addition, the TRP described in this disclosure means an antenna arrayhaving one or more antenna elements available in a network located at aspecific geographical location in a specific area. Although thisdisclosure is described with respect to “TRP” for convenience ofexplanation, the TRP may be replaced with a base station, a transmissionpoint (TP), a cell (e.g., a macro cell/small cell/pico cell, etc.), anantenna array, or a panel and understood and applied as such.

In addition, the CORESET group ID described in this disclosure may referto an index/identification information (e.g., ID)/indicator, etc. fordistinguishing a CORESET configured for/associated with each TRP/panel(or for each TRP/panel). In addition, the CORESET group may be agroup/union of CORESETs which is distinguished by theindex/identification information (e.g., ID) for distinguishing theCORESET and the CORESET group ID. For example, the CORESET group ID maybe specific index information defined in the CORESET configuration. Forexample, the CORESET group may be configured/indicated/defined by anindex defined in the CORESET configuration for each CORESET. The CORESETgroup ID may be configured/indicated via higher layer signaling (e.g.,RRC signaling)/L2 signaling (e.g., MAC-CE)/L1 signaling (e.g., DCI).

For example, ControlResourceSet information element (IE) that is ahigher layer parameter is used to configure a time/frequency controlresource set (CORESET). For example, the control resource set may berelated to detection and reception of downlink control information.Examples of the ControlResourceSet IE may include CORESET related ID(e.g., controlResourceSetID), an index of a CORESET pool for CORESET(e.g., CORESETPoolIndex), time/frequency resource configuration ofCORESET, and TCI information related to CORESET. For example, the indexof the CORESET pool (e.g., CORESETPoolIndex) may be set to 0 or 1.

For example, it may be indicated/configured so that PDCCH detection foreach TRP/panel is performed on a per CORESET group basis. And/or, it maybe indicated/configured so that uplink control information (e.g. CSI,HARQ-A/N, SR) and/or uplink physical channel resources (e.g.PUCCH/PRACH/SRS resources) for each TRP/panel are divided on a perCORESET group basis and managed/controlled. And/or, HARQ A/N(process/retransmission) for PDSCH/PUSCH, etc. scheduled for eachTRP/panel may be managed on a per CORESET group basis.

Further, the UE may recognize PUSCH (or PUCCH) scheduled by DCI receivedby different CORESETs (or CORESETs which belong to different CORESETgroups) as PUSCH (or PUCCH) transmitted to different TRPs or PUSCH (orPUCCH) of different TRPs. Further, a scheme for UL transmission (e.g.,PUSCH/PUCCH) transmitted to different TRPs may be applied equally evento UL transmission (e.g., PUSCH/PUCCH) transmitted to different panelswhich belong to the same TRP.

M-TRP Transmission Scheme

M-TRP transmission by which multiple (e.g., M) TRPs transmit data to oneuser equipment (UE) may be divided into two main types of transmission:eMBB M-TRP transmission (or M-TRP eMMB) which is a scheme for increasinga transmission rate and URLLC M-TRP transmission (or M-TRP URLLC) whichis a scheme for increasing a reception success rate and reducinglatency.

URLLC M-TRP may mean that M-TRPs transmit the same TB (Transport Block)using different resources (e.g., layers/time resources/frequencyresources, etc.). A number of TCI state(s) may be indicated by DCI to aUE configured with the URLLC M-TRP transmission scheme, and datareceived using the QCL reference signal (RS) of each TCI state may beassumed to be the same TB. On the other hand, eMBB M-TRP may mean thatM-TRPs transmit different TBs using different resources (e.g.,layers/time resources/frequency resources, etc.). A number of TCIstate(s) may be indicated by DCI to a UE configured with the eMBB M-TRPtransmission scheme, and data received using the QCL RS of each TCIstate may be assumed to be different TBs. In relation to at least eMBBM-TRP, each TCI code point within DCI may correspond to 1 or 2 TCIstates. If 2 TCI states are activated within one TCI code point, eachTCI state for at least DMRS type 1 may correspond to one CDM group.

For example, the UE may decide/determine whether the corresponding M-TRPtransmission is URLLC transmission or eMBB transmission since it usesthe RNTI configured for MTRP-URLLC and the RNTI configured forMTRP-eMBB, separately. That is, if the CRC masking of the DCI receivedby the UE is performed using the RNTI configured for the MTRP-URLLCpurpose, this may correspond to URLLC transmission, and if the CRCmasking of the DCI is performed using the RNTI configured for theMTRP-eMBB purpose, this may correspond to eMBB transmission.

Table 6 shows various schemes that can be considered for URLLC M-TRPtransmission. Referring to Table 6, there exist various schemes such asSDM/FDM/TDM.

TABLE 6 To facilitate further down-selection for one or more schemes inRAN

96bis, schemes for multi- TRP based URLLC, scheduled by single DCI atleast, are clarified as following:  •   Scheme 1 (SDM): n (n <= N

) TCI states within the single slot, with overlapped time and  frequency resource allocation  • Scheme 1a:   Each transmissionoccasion is a layer or a set of layers of the same TB, with each layeror layer   set is associated with one TCI and one set of DMRS port(s). •   Single codeword with one RV is used across all spatial layers orlayer sets. From the UE   perspective, different coded bits are mappedto different layers or layer sets with the same   mapping rule as inRel-15.  • Scheme 1b:  •   Each transmission occasion is a layer or aset of layers of the same TB, with each layer or layer   set isassociated with one TCI and one set of DMRS port(s).  •   Singlecodeword with one RV is used for each spatial layer or layer set. TheRVs corresponding   to each spatial layer or layer set can be the sameor different.  • Scheme 1c:  •   One transmission occasion is one layerof the same TB with one DMRS port associated with   multiple TCI stateindices, or one layer of the same TB with multiple DMRS ports associated  with multiple TCI state indices one by one.  • For Scheme 1a and 1c,the same MCS is applied for all layers or layer sets.  • For scheme 1b,same or different MCS/modulation orders for different layers or layersets can be   discussed.  •   Scheme 2 (FDM): n (n <

N

) TCI states within the single slot, with non-overlapped frequency  resource allocation  • Each non-overlapped frequencey resourceallocation is associated with one TCI state.  • Same single/multipleDMRS port(s) are associated with all non-overlapped frequency resources  allocations.  • Scheme 2a:  •   Single codeword with one RV is usedacross full resource allocation. From UE perspective, the   common RBmapping (codeword to layer mapping) is applied across full resourceallocation.  • Scheme 2b:  •   Single codeword with one RV is used foreach non-overlapped frequency resource allocation.   The RVscorresponding to each non-overlapped frequency resource allocation canbe the same or   different.  • For scheme 2a, same MCS is applied forall non-overlapped frequency resource allocations  • for scheme 2b, sameor different MCS/modulation orders for different non-overlappedfrequency   resource allocations can be discussed.  • Details offrequency resource allocation mechanism for FDM 2a/2b with regarding toallocation   granularity, time domain allocation can be discussed.  •Scheme 3 (TDM): n (n <= N

) TCI states within the single slot, with non-overlapped time resourceallocation  ∘ Each transmission occasion of the TB has one TCI and oneRV with the time granularity of mini-slot.  ∘ All transmission occasion(s) within the slot use a common MCS with same single or multiple DMRSport(s).  ∘ RV/TCI state can be same or different among transmissionoccasions.  ∘ FFS channel estimation interpolation across mini-slotswith the same TCI index  • Scheme 4 (TDM): n (n <= N

) TCI states with K (

K) different slots.  ∘ Each transmission occasion of the TB has one TCIand one RV.  ∘ All transmission occasion (s) across K slots use a commonMCS with same single or multiple DMRS port(s)  ∘ RV/TCI state can besame or different among transmission occasions.  ∘ FFS channelestimation interpolation across slots with the same TCI index Note thatM-TRP/panel based URLLC schemes shall be compared in terms of improvedreliability, efficiency, and specification impact. Note: Support ofnumber of layers per TRP my be discussed

indicates data missing or illegible when filed

For example, scheme3/4 of Table 6 is a scheme considered in TDM basedURLLC. Specifically, scheme 4 means a scheme in which one TRP transmitsthe TB in one slot and has an effect of increasing a data receptionprobability through the same TB received from multiple TRPs in multipleslots. Unlike this, scheme 3 means a scheme in which one TRP transmitsthe TB through several consecutive OFDM symbols (i.e., symbol group),and may be configured in such a manner that multiple TRPs transmit thesame TB through different symbol groups in one slot.

Method for Improving Reliability in Multi-TRPs

FIGS. 10A and 10B illustrate an example of a transmission/receptionmethod for improving reliability supported by a plurality of TRPs, andthe following two methods may be considered.

The example in FIG. 10A shows that a layer group transmitting the samecodeword (CW)/transport block (TB) correspond to different TRPs. Thatis, the same CW may be transmitted via different layers/layer groups. Inthis case, a layer group may refer to some kind of layer set made up ofone or more layers. As such, the amount of transmission resourcesincreases as the number of layers increases, and this is advantageous inthat robust channel coding with a low code rate can be used for TB. Inaddition, it is expected that the reliability of received signals may beimproved based on diversity gain due to different channels from aplurality of TRPs.

The example in FIG. 10B shows an example in which different CWs aretransmitted via layer groups corresponding to different TRPs. That is,different CWs may be transmitted through different layers/layer groups.In this case, it may be assumed that TBs corresponding to the first CW(CW #1) and the second CW (CW #2) are the same. Therefore, this can beseen as an example of repeated transmission of the same TB. In the caseof FIG. 10B, the code rate corresponding to the TB may be higher thanthat of FIG. 9. Still, there is an advantage that a code rate can beadjusted by indicating different redundancy version (RV) values forencoding bits generated from the same TB according to a channelenvironment, or that a modulation order of each CW may be adjusted.

In FIG. 10A or FIG. 10B, the same TB is repeatedly transmitted viadifferent layer groups, and each layer group is transmitted by differentTRPs/panels, thereby increasing the data reception probability, whichmay be called spatial division multiplexing (SDM)-based URLLC M-TRPtransmission. A layer(s) belonging to different layer groups aretransmitted through DMRS ports belonging to different DMRS CDM groups,respectively.

In addition, although the above description regarding multiple TRPs hasbeen given with respect to a spatial division multiplexing (SDM) schemeusing different layers, it also may be extensively applied to afrequency division multiplexing (FDM) scheme based on differentfrequency domain resources (e.g., RB/PRB (set)), and/or a time divisionmultiplexing (TDM) scheme based on different time domain resources(e.g., slots, symbols, and sub-symbols).

Hereinafter, in the present disclosure, methods that can be proposed inconsideration of cooperative transmission (e.g., NCJT) between multiplebase stations (e.g., multiple TPs/TRPs of one or more base stations) andUE will be described. Specifically, Proposal 1 proposes a method forconfiguring an eMBB operation or URLLC operation and a method forindicating/configuring a URLLC operation scheme. Proposal 2 proposes amethod for configuring the number of repeated transmission times byconsidering the URLLC operation scheme. Proposal 3 proposes a method forconfiguring/indicating a transmission resource region in repeatedtransmission in the time domain. Proposal 4 proposes a method fordefining/configuring a TCI state field in the DCI by considering theURLLC operation.

As described above, each TRP may be distinguished based on an index(e.g., CORESETPoolIndex) (or CORESET group ID) of a CORESET poolconfigured to a CORESET. Although the methods described herein aredescribed based on one or more TP/TRPs of base station(s), the methodsmay be equally or similarly applied to transmissions based on one ormore panels of base station(s).

<Proposal 1>

As described above, multi-TRP (hereinafter, M-TRP) based transmissionmay be classified into an eMBB operation (i.e., eMBB M-TRP) and a URLLCoperation (i.e., URLLC M-TRP). The URLLC operation may be largelyclassified into operations of four schemes (e.g., schemes 1, 2, 3, and4) as organized in Table 6. Since a resource configuration method and amapping relationship between the TCI state and the resource should bedefined differently for the eMBB operation and the URLLC operation, theBS needs to configure/indicate which operation is to be performed to theUE.

When a situation is considered in which transmission of data for URLLCis unexpectedly required due to occurrence of an urgent situation in aUE receiving data for eMBB, it may be preferred that the eMBB operationand the URLLC operation are dynamically indicated through the DCI ratherthan the eMBB operation and the URLLC operation are semi-staticallyconfigured through the higher layer signaling. In the presentdisclosure, the data for eMBB and the data for URLLC are described byassuming the multi-TRP transmission, but the method and/or theembodiment proposed in the present disclosure may be applied even tosingle TRP transmission. Further, a situation may be assumed in whichthe data for URLLC is transmitted in a transmission resource allocatedto the UE based on scheduling of the BS. For example, the UE may receivethe data for URLLC through the PDSCH scheduled through the DCI of thecorresponding PDCCH after detecting the PDCCH in the CORESET.

Hereinafter, the method for configuring an eMBB operation or URLLCoperation to the UE and the method for indicating/configuring a URLLCoperation scheme proposed in the present disclosure will be described indetail.

The BS may configure, to the UE, in which scheme among multiple URLLCoperations (e.g., scheme 1 to scheme 4) to perform URLLC M-TRPtransmission through the higher layer signaling. For example, a higherlayer parameter (e.g., RepSchemeEnabler) for indicating one of theschemes for the URLLC operation may be configured/defined. As anexample, whether the corresponding scheme is an FDM based scheme (e.g.,scheme 2a/2b) or a TDM based scheme (scheme 3/4) may be configured byusing the higher layer parameter.

As described in Table 6, multiple schemes related to the URLLC operationare defined, and since the schemes have a similarity in terms ofreliability and latency, a specific scheme may not be required to bedynamically selected. Accordingly, a specific operation (e.g., one ofschemes 2a/2b, 3, and 4) among multiple URLLC operations may besemi-statically configured to the UE through the higher layer signaling,and whether the specific URLLC operation semi-statically configured isperformed may be dynamically indicated through the DCI. For example,scheme 3 (i.e., TDM scheme) may be configured to the UE through thehigher layer signaling, and the URLLC operation of scheme 3 may beenabled/disabled.

Since it may be assumed that operations included in scheme 1 among theURLLC operations have no difference in terms of the UE compared with theeMBB operation, it may be assumed that the operations included in scheme1 may be excluded from a candidate of the specific operationsemi-statically configured to the UE through the higher layer signalingin the above-described example, but the operations included in scheme 1may also be included in the candidate and semi-statically configured tothe UE.

A specific field in the DCI may be used for dynamically indicatingwhether to perform the URLLC operation.

For example, a specific bit of field ‘Antenna port(s)’ for indicatingthe DMRS port in DCI (e.g., DCI format 1_1) may be used for the dynamicindication. In the following description, the DMRS port indication fieldmay mean the field ‘Antenna port(s)’. In Proposal 1 of the presentdisclosure, “the specific bit of the DMRS port indication field in theDCI may be used” may mean that all or some bits constituting thecorresponding field or codepoints corresponding to the correspondingbits may be used for the method and/or the embodiment of Proposal 1.Further, the interpretation may also be similarly applied even to thefollowing other proposals (e.g., Proposals 2 to 4).

Multiple TCI states may be indicated to the UE, and in this case, the UEmay implicitly know that the corresponding operation is a multi-TRPtransmission operation, and optimize the DMRS port indication field bynewly constituting a DMRS port combination for multi-TRP transmission.In the case of optimizing the DMRS port indication field, whether thecorresponding operation is the eMBB operation or the URLLC operation maybe indicated through most significant bit (MSB) or least significant bit(LSB) of the DMRS port indication field, and the DMRS port combinationmay be constituted by optimization to each operation by using theremaining bit(s) other than the corresponding bit among the bitsconstituting the DMRS port indication field.

The following proposal may be together considered as a method fordynamically indicating, by the BS, to the UE, different service typessuch as the eMBB operation or the URLLC operation.

In the Rel-15 standard, DCI format 1_1 is used for scheduling of thePDSCH in one cell. The DCI includes the antenna port(s) field (i.e.,DMRS port indication field), and the corresponding field is defined inTable 7.3.1.2.2-1/2/3/4 of TS 38.212. Hereinafter, ‘Rel-15 DMRS tables’may mean the DMRS tables. The numbers of DRMS ports and DMRS CDMgroup(s) without data may be determined according to a value of theantenna port(s) field.

Meanwhile, DMRS tables having an enhanced function capable of supportinga new DMRS port combination may be introduced by considering themulti-TRP transmission, and hereinafter, ‘Rel-16 DMRS tables’ may meanthe DMRS tables.

Whether the URLLC operation is performed may be dynamically indicatedthrough Rel-16 DMRS tables. More characteristically, in a state in whichthe UE is configured to use the Rel-16 DMRS tables, multiple TCI statesmay be indicated to the UE through the DCI, and when 2 CW transmissionis indicated, whether the URLLC operation is performed may bedynamically indicated through a specific codepoint(s) of the DMRS portindication field. A specific embodiment for the operation will bedescribed below.

‘A state in which the UE is configured to use the Rel-16 DMRS tables’may be interpreted as being configured through the higher layersignaling (e.g., RRC/MAC CE) to apply the Rel-16 DMRS tables forinterpreting the DMRS port indication field in the DCI. In other words,the state may mean a case where the DMRS port indication field in theDCI is configured/indicated to be interpreted based on a newly definedDMRS table (e.g., Rel-16 DMRS tables). For example, the operation may beconfigured through an explicit RRC/MAC CE parameter for the purpose.Alternatively, the operation may be configured by an implicit method. Asan example of the implicit method, when there is a codepoint mapped tomultiple TCI states among codepoints of the TCI state field in the DCIthrough the MAC CE operation, the Rel-16 DMRS tables may be configuredto be used.

‘A case of indicating 2-CW transmission’ may mean a case where anMCS/NDI/RV value is indicated in each TB field for transport block (TB)1 and TB 2 in a state in which the maximum number of codewords isconfigured to 2 (i.e., a state in which maxNrofCodeWordsScheduledByDCI=2is configured). Here, the TB field may mean a DCI field for indicatingthe MCS/NDI/RV of each TB. That is, the TB field may be a conceptincluding an MCS field, an NDI field, and an RV field. Meanwhile, when aspecific TB field is indicated as MCS=26 and RV=1, it may be interpretedthat the corresponding TB is disabled, and in the proposed operation, itmay be assumed that such a situation does not occur. That is, asituation may be assumed in which both TB fields do not satisfy acombination of MCS=26 and RV=1.

‘A case where whether the URLLC operation is performed is dynamicallyindicated through a specific codepoint(s) of the DMRS port indicationfield’ may mean the following case.

Table 7 as an example of a DMRS table of Rel-15 shows Table 7.3.1.2.2-2defined in TS38.212. Referring to Table 7, when both CWs 0 and 1 areenabled (i.e., when in the case of 2 codeword transmission), the valueof the DMRS port indication field may be interpreted according to aright column of two codewords, and in this case, the value of the DMRSport indication field may be indicated only for layers of 5 layers ormore. In the Rel-15 DMRS table, a combination of the DMRS ports isdefined only for four codepoints (e.g., values 0 to 3) for twocodewords. Accordingly, the URLLC operation may be dynamically indicatedby using codepoints defined as reserved up to 4-31. To this end, a newRel-16 DMRS table may be defined based on the Rel-15 DMRS table.

TABLE 7 One Codeword: Two Codewords: Codeword 0 enabled, Codeword 0enabled, Codeword 1 disabled Codeword 1 enabled Number Number of of DMRSNumber DMRS Number CDM of CDM of group(s) front- group(s) front- withoutDMRS load without DMRS load Value data port(s) symbols Value dataport(s) symbols 0 1 0 1 0 2 0-4 2 1 1 1 1 1 2 0, 1, 2, 3, 4, 6 2 2 1 0,1 1 2 2 0, 1, 2, 3, 4, 5, 6 2 3 2 0 1 3 2 0, 1, 2, 3, 4, 5, 6, 7 2 4 2 11 4-31 reserved reserved reserved 5 2 2 1 6 2 3 1 7 2 0, 1 1 8 2 2, 3 19 2 0-2 1 10 2 0-3 1 11 2 0, 2 1 12 2 0 2 13 2 1 2 14 2 2 2 15 2 3 2 162 4 2 17 2 5 2 18 2 6 2 19 2 7 2 20 2 0, 1 2 21 2 2, 3 2 22 2 4, 5 2 232 6, 7 2 24 2 0, 4 2 25 2 2, 6 2 26 2 0, 1, 4 2 27 2 2, 3, 6 2 28 2 0,1, 4, 5 2 29 2 2, 3, 6, 7 2 30 2 0, 2, 4, 6 2 31 Reserved ReservedReserved

Table 8 shows an example of the Rel-16 DMRS table defined based on theRel-15 DMRS table of Table 7 described above. Table 8 is just an examplefor convenience of the description and does not limit the technicalscope of the present disclosure. Accordingly, it is apparent that theRel-16 DMRS table is not limited to an example of Table 8, and can beexpanded to another combination of the DMRS ports in a form having thesame feature.

TABLE 8 One Codeword: Two Codewords: Codeword 0 enabled, Codeword 0enabled, Codeword 1 disabled Codeword 1 enabled Number Number of of DMRSNumber DMRS Number CDM of CDM of group(s) front- group(s) front- withoutDMRS load without DMRS load Value data port(s) symbols Value dataport(s) symbols 0 1 0 1 0 2 0-4 2 1 1 1 1 1 2 0, 1, 2, 3, 4, 6 2 2 1 0,1 1 2 2 0, 1, 2, 3, 4, 5, 6 2 3 2 0 1 3 2 0, 1, 2, 3, 4, 5, 6, 7 2 4 2 11 4 1 0 1 5 2 2 1 5 1 1 1 6 2 3 1 6 1 0, 1 1 7 2 0, 1 1 7 2 0 1 8 2 2, 31 8 2 2 1 9 2 0-2 1 9 2 0, 1 1 10 2 0-3 1 10 2 2, 3 1 11 2 0, 2 1 11 2 02 12 2 0 2 12 2 2 2 13 2 1 2 13 2 0, 1 2 14 2 2 2 14 2 2, 3 2 15 2 3 215-31 reserved reserved reserved 16 2 4 2 17 2 5 2 18 2 6 2 19 2 7 2 202 0, 1 2 21 2 2, 3 2 22 2 4, 5 2 23 2 6, 7 2 24 2 0, 4 2 25 2 2, 6 2 262 0, 1, 4 2 27 2 2, 3, 6 2 28 2 0, 1, 4, 5 2 29 2 2, 3, 6, 7 2 30 2 0,2, 4, 6 2 31 Reserved Reserved Reserved

Referring to Table 8, when codepoints corresponding to values 4 to 14are indicated to the UE upon transmission of two CWs, the UE may knowthat the corresponding operation is the URLLC operation.

Specifically, one operation of multiple URLLC operations may beconfigured to the UE through the higher layer signaling according to themethod of Proposal 1 described above, and the UE may know which schemeshould be performed. In this case, the Rel-16 DMRS table may be appliedto the value indicted through the DMRS port indication field of the DCI,and a detailed operation may be assumed as below according to the schemeconfigured to the UE through the higher layer signaling (Meanwhile, whenone value of values 0 to 3 is indicated to the UE, the operation may beperformed similarly to the Rel-15 DMRS table. That is, the transmissionmay be interpreted as transmission of two CWs corresponding to differentTBs.).

For example, it may be assumed that when scheme 2a is configured throughthe higher layer signaling, if one value of values 4 to 14 is indicated,multiple TCI states indicted to the UE are mapped to different frequencydomains. In this case, TB information for determining a TB size may bedefined according to a fixed rule to be based on a specific value of TBs1 and 2, or configured through signaling between the BS and the UE. Inthis case, a value of a TB field not applied to determination of the TBsize may be fixed to a combination of specific MCS, RV, and NDI values.For example, upon receiving DCI in which MCS=0 and RV=0 are configured,the UE may know that the TB field of the corresponding DCI is not usedfor determining the TB size.

For example, it may be assumed that when Scheme 2b/3/4 is configuredthrough the higher layer signaling, if one value of values 4 to 14 isindicated, different CWs transmitted to the UE are based on the same TB(i.e., different CWs are encoded from the same TB). That is, the UE mayassume that two CWs are mutually repeatedly transmitted CWs. In thiscase, the TB information for determining the TB size may be definedaccording to a fixed rule to be based on a specific value of TBs 1 and2, or configured through signal exchange between the BS and the UE.

In this case, a value of a TB field not applied to determination of theTB size may be fixed to a combination of specific MCS, RV, and NDIvalues. For example, the value of the TB field may be defined as MCS=0and RV=0. Alternatively, the value of the TB field not applied todetermination of the TB size may be used as a usage for indicating amodulation order of repeatedly transmitted CW and/or the RV value. Inthis case, a TB field for determining the TB size and a TB field fordetermining the modulation order/RV for a TB corresponding to a specificCW may be different. For example, the TB size is determined based on theMCS of field TB 1 for CW #2 (or CW #1), but the modulation order/RV mayadopt a value indicated by field TB 2.

Each codepoint of Table 8 may have the following features.

First, the maximum number of UEs which are multi-user (MU) paired islimited to 2. The reason is that when the number of UEs which is MUpaired increases, mutual interference may increase, and as a result,capability deterioration may occur. Accordingly, the mutual interferencemay be reduced by limiting the maximum number of UEs which are enabledto be MU paired.

Second, the UEs which are MU paired are indicated by DMRS ports ofdifferent CDM groups. The reason is that when the UEs which are MUpaired are indicated by DMRS ports of the same CDM group, interferencebetween the DMRS ports may increase. Accordingly, the DRMS ports ofdifferent CDM groups are allocated to different UEs to reduce mutualinterference. Meanwhile, in the case of value 4/5, it is assumed thatthe DMRS ports of the same CDM group may be allocated to different UEs,and the reason is that it may be assumed that the PDSCH may be togethermultiplexed to the DMRS symbol, and more robust channel coding may beused.

In the example, it is assumed that one value of the URLLC schemes (e.g.,schemes 2a, 2b, 3, and 4) is configured in advance through the higherlayer signaling, but even otherwise, the method for dynamicallyindicating the URLLC operation may be supported based on the proposal.For example, in a state in which the UE is configured to use the Rel-16DMRS tables, multiple TCI states may be indicated to the UE through theDCI, and when 2 CW transmission is indicated, whether a specificoperation corresponding to one of the URLLC schemes (e.g., schemes 2a,2b, 3, and 4) is performed may be dynamically indicated through aspecific codepoint(s) of the DMRS port indication field. To this end,different codepoint(s) may be defined to correspond to differentschemes. For example, in the example of Table 8, values 4 to 14 maycorrespond to scheme 2a, and values 15 to 31 may be utilized fordefining the DMRS ports combination corresponding to scheme 2b/3/4.

As in the proposed method described above, the UE may be configured withthe URLLC operation scheme based on the higher layer signaling. Further,the UE may be configured with a higher layer parameter related to thecorresponding URLLC operation together with the URLLC operation scheme.For example, in addition to the operation scheme, additional parameters(e.g., the number of repetition times, a repetition period, etc.)required for performing the corresponding operation scheme may betogether configured in the higher layer parameter. As such, it may beanticipated that the BS which intends to indicate the URLLC operation tothe UE will configure the higher layer parameter related to the URLLCoperation to the UE. On the contrary, in the case of a UE not requiringthe URLLC operation, the higher layer parameter related to the URLLCoperation may not be configured. Accordingly, the UE may differentlyinterpret the DMRS port indication field based on whether to configurethe higher layer parameter related to the URLLC operation.

For example, (i) when the UE is configured with the higher layerparameter related to the URLLC operation, a specific bit of the DMRSport indication field may be used as a usage for dynamically indicatingthe URLLC operation according to the proposal. On the contrary, (ii)when the UE is not configured with the higher layer parameter related tothe URLLC operation, the specific bit of the DMRS port indication fieldmay be used as a usage for indicating single TRP transmission or dynamicpoint selection from multi-TRP. As an example for the (ii) operation,when the UE indicated with multiple TCI states is indicated with aspecific codepoint through the DMRS port indication field, the UE mayassume the single TRP transmission or dynamic point selection frommulti-TRP other than the multi-TRP transmission. As an example of thespecific codepoint, there may be a codepoint indicating a case where theDMRS port combination indicated to the UE is included in a single CDMgroup.

Meanwhile, in respect to the URLLC operation, whether the URLLCoperation is performed may be configured to the UE based on a higherlayer configuration and/or RNTI and/or a specific field(s). In thiscase, when different TB fields (e.g., TB field 1/TB field 2) are definedin the DCI, the UE may also assume that a second CW is disabledregardless of an MCS/RV/NDI value indicated through the TB field for thespecific TB field. When it may be assumed that a second C2 is disabled,since single CW transmission may be performed while using two differentTB fields, there is an advantage in that different MCS/RV values may beindicated for different transmission occasions in the URLLC scheme.

An M-TRP URLLC operation or M-TRP eMBB operation may be configured basedon the method of Proposal 1 described above, and a specific scheme amongmultiple schemes of the M-TRP URLLC operation may be additionallyconfigured/enabled.

<Proposal 2>

In relation to the URLLC operation, scheme 3 and scheme 4 of Table 6described above correspond to a repeated transmission scheme of the timedomain. Proposal 2 of the present disclosure proposes a method forconfiguring/indicating the number of transmission times for repeatedtransmission for scheme 3 and scheme 4. As a method forconfiguring/indicating the total number of repeated transmission times,a method for configuring a specific value to the UE through the higherlayer parameter or indicating the number of repeated transmission timesbased on the specific field in the DCI may be considered. Hereinafter,the method for configuring the number of repeated transmission times byconsidering the URLLC operation scheme will be described in detail.

Scheme 3 may mean repeated transmission achieved in units of mini-slotby a TDM based scheme. For scheme 3, 2, 4, and 7 symbols unittransmission occasions may be defined. In Scheme 3 (TDM), n (n<=Nt1) TCIstates may be indicated together with non-overlapped time resourceallocation. Each transmission occasion of the TB has one TCI and one RVtogether with the time granularity of the mini-slot. All transmissionoccasion(s) in the slot uses a common MCS together with the same singleor multiple DMRS port(s). The RV/TCI state may be the same or differentbetween the transmission occasions.

As the method for configuring the number of repeated transmission times,a method for determining the total number of repeated transmission timesaccording to the configured/indicated number of TCI states is proposed.In other words, the total number of repeated transmission times may bedetermined according to the configured/indicate number of TCI states.

For example, multiple TCI states for repeated transmission may beindicated through ‘Transmission configuration indication’ field(hereinafter, may be referred to as a TCI state field) defined forindicating the TCI state in the DCI (e.g., DCI format 1_1). Eachcodepoint in the TCI state field may correspond to one or more TCI statevalues, and codepoints corresponding to multiple TCI states areindicated to the UE to configure/indicate multiple TCI states to thecorresponding UE.

For example, when the number of TCI states is 4, each symbol granularity(i.e., transmission occasion) may be repeated four times. As an example,when the transmission occasion is a 2 symbol granularity, the 2 symbolgranularity may be repeated four times (2++2++2++2). As an example, whenthe transmission occasion is a 4 symbol granularity, the 4 symbolgranularity may be repeated four times (4++4++4++4). As an example, whenthe transmission occasion is a 7 symbol granularity, the 7 symbolgranularity may be repeated four times (7++7++7++7).

As another example, when the number of TCI states is 2, each symbolgranularity may be repeated two times. As an example, when thetransmission occasion is the 2 symbol granularity, the 2 symbolgranularity may be repeated two times (2++2). As an example, when thetransmission occasion is the 4 symbol granularity, the 4 symbolgranularity may be repeated two times (2+4). As an example, when thetransmission occasion is the 7 symbol granularity, the 7 symbolgranularity may be repeated two times (2+7).

A reason why the total number of repeated transmission times may bedefined according to the configured/indicated number of TCI states as inthe example is that repeated transmission exceeding theconfigured/indicated number of TCI states may be replaced with amini-slot structure constituted by more symbol(s). In the abovedescription, the ‘mini-slot structure’ may mean a scheduling structurehaving a granularity of 2, 4, 6, or 7 symbols which may be indicated byPDSCH mapping type B.

When the configured/indicated number of TCI states and the number ofrepeated transmission times are expressed as x and y, respectively, acase where x is larger than y may be regarded as a case of repeatedtransmission exceeding the configured/indicated number of TCI states.

For example, when the configured/indicated number of TCI states is 2 anda mini-slot having a structure of 2 symbols is repeated four times, a2+2+2+2 structure is provided, and this may be replaced with repeating amini-slot having a structure of four symbols two times. That is, (interms of considering DMRS overhead), a scheme of repeating the mini-slothaving the structure of fourth symbols two times may be more efficientthan a scheme of repeating the mini-slot having the structure of twosymbols four times. Since the configured/indicated number of TCI statesis 2 in the example, when the TCI states are repeatedly transmitted fourtimes, the same TCI states are repeatedly shown. However, when this isrepeatedly transmitted two times by using a larger mini-slot structure,there is an advantage in that the same TCI states are not repeated, andthe DMRS overhead may be reduced most of all. Similarly to the example,even with respect to a case where the configured/indicated number of TCIstates is 4 and the mini-slot having the structure of 2 symbols isrepeated eight times, a 2+2+2+2+2+2+2+2 structure may be similarlyreplaced with the 4+4+4+4 structure.

Accordingly, as described in the example, the number of repeatedtransmission times exceeding the configured/indicated number of TCIstates may be replaced with a mini-slot structure having another numberof symbols, and as a result, capability enhancement may be anticipatedthrough an effect of reducing the DMRS overhead.

In conclusion, the number of repeated transmission times may beindicated through the number of TCI states indicated to the UE. That is,the number of repetition times of the transmission occasion may bedetermined based on the number of TCI states corresponding to thecodepoints of the TCI field in the DCI. For example, when 2 TCI statesare indicated to the UE, the total number of transmission occasions maybe 2 and the repeated transmission may be made two times, and when 4 TCIstates are indicated, the total number of transmission occasions may be4 and the repeated transmission may be made four times. In addition, aQCL assumption for each transmission occasion may sequentially apply theTCI states indicated to the UE. For example, the transmission occasionsmay be sequentially mapped in such a manner that a 1st transmissionoccasion is mapped to a 1st TCI state and a 2nd transmission occasion ismapped to a 2nd TCI state.

Meanwhile, scheme 4 (TDM) may mean repeated transmission made in theslot granularity. In Scheme 4, n (n<=Nt2) TCI states may be indicated inK (n<=K) different slots. Each transmission occasion of the TB has oneTCI and one RV. All transmission occasion(s) across K slots uses acommon MCS together with the same single or multiple DMRS port(s). TheRV/TCI state may be the same or different among the transmissionoccasion(s).

Latency of scheme 4 cannot but become longer due to a feature that therepeated transmission is made in the slot granularity, and as a result,it may be more preferable to use scheme 4 as a usage for increasingreliability than the latency. In this case, since the reliability may beenhanced by increasing a reception SNR through the repeatedtransmission, the number of repeated transmission times larger than theindicated number of TCI states may be considered.

Accordingly, in the case of scheme 4, the number of repeatedtransmission times may be configured through the higher layer signaling(e.g., RRC/MAC CE). For example, a higher layer parameter (e.g.,repetitionnumber) for configuring the number of repeated transmissiontimes may be defined, and the number of repeated transmission times maybe configured through the corresponding parameter. As an example, thenumber of repeated transmission times may be configured to one of 2, 3,4, 5, 6, 7, 8, or 16.

Alternatively, even in the case of scheme 4, a method for dynamicallyindicating, by the BS, the number of repeated transmission times to theUE may be considered. In this case, there are an advantage in that asignaling method defined for M-TRP based URLLC such as scheme 3 may beutilized as it is, and an advantage in that the repetition number isdynamically adjusted even for scheme 4 by considering various servicetypes, and as a result, the latency may be adjusted according to aspecific service type. As the signaling method for dynamicallyindicating the number of repeated transmission times for the case ofscheme 4 to the UE, the following proposed may be adopted.

The BS may configure information related to the number of repeatedtransmission times applicable to scheme 4 to the UE through the higherlayer signaling (e.g., RRC/MAC CE). For example, a candidate value(s)for the applicable number of repeated transmission times may beindicated. Alternatively, a candidate value(s) for the number ofrepeated transmission times fixed or predefined between the BS and theUE may be defined. The candidate value may mean some/all values whichthe BS configures to the UE through the higher layer signaling based ona pre-configured/defined promise/rule/condition among the numbers ofrepeated transmission times applicable to scheme 4 above.

The BS may explicitly or implicitly a specific value among the candidatevalue(s) for the number of repeated transmission times which may beindicated to the UE through a specific field in the DCI. The specificfield in the DCI may be a field newly defined for the number of repeatedtransmission times or a conventional field (e.g., the TCI state field,the antenna port(s) field, the MCS field, the NDI field, the RV field,etc.).

For example, when the number of repeated transmission times applicableto scheme 4 above is configured to the UE through the higher layersignaling, it may be assumed that {2, 4, 8, 16} is defined as theapplicable number of repeated transmission times. {2, 4, 8, 16} is justan example of the candidate values for the number of repeatedtransmission times, and does not limit the technical scope of thepresent disclosure. Accordingly, it may be possible that the number ofrepeated transmission times is configured to another value (e.g., 2, 3,4, 5, 6, 7, 8, 16, etc.). Alternatively, the some number of transmissiontimes among the values, as an example, value such as {2, 8} may beconfigured to the UE through the higher layer signaling. In addition, aspecific value of the candidate value(s) (e.g., {2, 8}) may be indicatedthrough the specific field in the DCI.

Hereinafter, examples of the method for dynamically indicating thenumber of repeated transmission times through the specific field in theDCI will be described.

Example 1) The number of repeated transmission times may be indicated byusing the TCI state field in the DCI.

For example, the number of repeated transmission times may be mapped tothe codepoint of the TCI state field, and the BS may indicate thespecific number of repeated transmission times to the UE through/usingthe codepoint value indicated to the UE through the TCI state field. Asa specific example, a repetition number corresponding to {2} may bemapped to a value in which the codepoint of the TCI state fieldcorresponds to 0 (i.e., 000) to 3 (i.e., 011), and a repetition numbercorresponding to {8} may be mapped to a value in which the codepointcorresponds to 4 (i.e., 100) to 7 (i.e., 111). For example, a mappingrelationship between the codepoint and the repetition number may bepre-defined between the UE and the BS.

As another example, a method for indicating whether repeatedtransmission corresponding to a relevant specific repetition number isperformed through the specific field in the DCI after the specificrepetition number is configured to the UE through the higher layersignaling may also be considered. For example, the repetition numbercorresponding to {2} may be configured through the higher layersignaling, and whether the repeated transmission corresponding to therelevant repetition number is performed may be indicated through acodepoint of a specific TCI state field. For example whether therepeated transmission corresponding to the relevant repetition number(e.g., 2) may be enabled through the codepoint of the specific TCI statefield. Further, as in the following example, information on whether therepeated transmission being performed may also be indicated through thespecific field in the DCI.

Example 2) Modulation and Coding Scheme (MCS)/New Data Indicator(NDI)/Redundancy Version (RV) fields for a second transport block (TB)of the DCI may be used. For example, different repeated transmissionnumbers may be mapped to a codepoints corresponding to the MCS, NDI, andRV fields for the second TB, and the BS may indicate, to the UE, aspecific repeated transmission number through the relevant field.

Example 3) The antenna port(s) field of the DCI may be used. Even inExample 3, it is assumed that the values such as {2, 8} are configuredto the UE through the higher layer signaling. For example, a specificrepetition number may be indicated based on a rank value (e.g., DRMSport(s) number) or/and the number of CDM groups or/and an index of theCDM group indicated through the antenna port(s) field.

As an example, when the rank value is equal to or smaller than aspecific value (and/or a pre-configured/defined value), a smaller value(e.g., {2}) of the repetition numbers (e.g., {2, 8}) configured throughthe higher layer signaling may be indicated. On the contrary, when therank value is larger than the specific value, a larger value (e.g., {8})of the repetition numbers (e.g., {2, 8}) configured through the higherlayer signaling may be indicated.

As an example, when the indicated number of CDM groups is 2 or more,i.e., when the indicated DMRS port(s) are included in different CDMgroups, the smaller repetition number of the repetition numbers (e.g.,{2, 8}) configured through the higher layer signaling may be indicated,and when the indicated number of CDM groups is 1, i.e., when theindicated DMRS port(s) are included in the same CDM group, a largerrepetition number may be indicated. Alternatively, when the indicatednumber of CDM groups is 2 or more, i.e., when the indicated DMRS port(s)are included in different CDM groups, the larger repetition number maybe indicated, and when the indicated number of CDM groups is 1, i.e.,when the indicated DMRS port(s) are included in the same CDM group, asmaller repetition number may be indicated.

As an example, when the indicated CDM group index is 0, i.e., when theindicated DMRS port(s) are included in CDM group 0, the smallerrepetition number may be indicated, and when the indicated CDM groupindex is 1, i.e., when the indicated DMRS port(s) are included in CDMgroup 1, the larger repetition number may be indicated. Alternatively,when the indicated CDM group index is 0, i.e., when the indicated DMRSport(s) are included in CDM group 0, the larger repetition number may beindicated, and when the indicated CDM group index is 1, i.e., when theindicated DMRS port(s) are included in CDM group 1, the smallerrepetition number may be indicated.

Example 4) Example 4 is another example using the antenna port(s) field.When the DMRS antenna port index is indicated to the UE through theantenna port(s) field, the repeated transmission number is jointlyencoded to indicate the repeated transmission number to the UE jointlywith the DMRS antenna port.

Table 9 shows an example in which a repeated transmission numbercorresponding to the DMRS antenna port is jointly encoded and indicated.Table 9 is just an example for convenience of description, and does notlimit the technical scope of the present disclosure, and it is apparentthat Table 9 may be extended to another form by applying a feature ofthe proposed method described in the present disclosure. For example, aDMRS port corresponding to each value of the codepoint which may beindicated through the antenna port field may be pre-defined and therepeated transmission number may be additionally pre-defined/configuredto correspond to each codepoint jointly with the DMRS port.

TABLE 9 One Codeword: One Codeword: Codeword 0 enabled, Codeword 0enabled, Codeword 1 disabled Codeword 1 disabled Number Number of DMRSof DMRS CDM CDM the group(s) group(s) number without DMRS without DMRSof Value data port(s) Value data port(s) repetition 0 1 0 0 1 0 k1 1 1 11 1 1 k1 2 1 0, 1 2 1 0, 1 k1 3 2 0 3 2 0 k1 4 2 1 4 2 1 k1 5 2 2 5 2 2k1 6 2 3 6 2 3 k1 7 2 0, 1 7 2 0, 1 k1 8 2 2, 3 8 2 2, 3 k1 9 2 0-2 9 20 k2 10 2 0-3 10 2 1 k2 11 2 0, 2 11 2 0, 2 k1 12-15 Reserved Reserved12 2 2 k2 13 2 3 k2 14 2 0, 1 k2 15 2 2, 3 k2

In Table 9, a left side shows an example of the antenna port(s) fielddefined in the current standard (see TS38.212 table 7.3.1.2.2-1). Aright side shows an example of an enhanced antenna port(s) field towhich the proposed method of the present disclosure is applied.Referring to Table 9, in a right table, values 9, 10, and 12 to 15 arenewly added parts, and an example of the enhanced DMRS table may havethe following feature.

First, the total number of transmission layers may be limited. Sincehigh throughput is not required in the URLLC operation, a large numberof transmission layers may not be supported. Accordingly, it may benewly defined that the number of transmission layers is limited to aspecific value or less and a codepoint indicating a value exceeding therelevant number of layers indicates another value. In the example of theDMRS table, values corresponding to values 9 and 10 originally define aDMRS port(s) combination capable of indicating 3 and 4 layers, but maybe defined to correspond to another value by applying the number oftransmission layers being limited to the specific value (e.g., 2) orless.

Second, a specific codepoint of a relevant field may be mapped to aspecific repeated transmission number. In the example of the enhancedDMRS table, k1 and k2 may correspond to the specific repeatedtransmission number. k1 and k2 may become values configured through thehigher layer signaling or defined by a static rule between the BS andthe UE. In the example of the DMRS table, values 3, 4, 5, 6, 7, and 8and values 9, 10, 12, 13, 14, and 15 indicate the same DMRS port indexand CDM group number (‘number of DMRS CDM group(s) without data’), butthere is a feature that each repeated transmission number is differentas k1 or k2.

Although not applied in the example of the DMRS table, the number of CDMgroups may also be limited to a specific value in order to support newmore combinations for the DMRS ports and the repeated transmissiontimes. For example, when only 2 is limited to be supported as the numberof CDM groups in Example 4 above, values corresponding to values 0, 1,and 2 may correspond to a new combination.

Example 5) Another example using the antenna port(s) field of the DCI isproposed. A specific repetition number may be indicated based on theindex of the DMRS antenna port(s) indicated through the antenna port(s)field.

For example, a specific repeated transmission number may be mapped to aspecific DRMS antenna port or DMRS antenna ports (i.e., DMRS antennaport group).

Table 10 shows an example of mapping and configuring the repeatedtransmission number for each DMRS antenna port. That is, Table 10 showsan example in which different repeated transmission numbers are mappedto different DMRS antenna ports. Table 11 shows an example of mappingand configuring the repeated transmission number for each DMRS antennaport group. That is, Table 11 shows an example in which differentrepeated transmission numbers are mapped by a group granularityconstituted by multiple DMRS antenna ports.

TABLE 10 Type 1 Type 2 DMRS the number DMRS the number port ofrepetition port of repetition 0 k1 0 k1 1 k2 1 k2 2 k3 2 k3 3 k4 3 k4 4k5 4 k5 5 k6 5 k6 6 k7 6 k7 7 k8 7 k8 8 k9 9 k10 10 k11 11 k12

TABLE 11 Type 1 Type 2 DMRS the number DMRS the number port ofrepetition port of repetition 0 k1 0 k1 1 k1 1 k1 2 k2 2 k2 3 k2 3 k2 4k3 4 k3 5 k3 5 k3 6 k4 6 k4 7 k4 7 k4 8 k5 9 k5 10 k6 11 k6

In the examples of Tables 10 and 11, k1 to k12 mean different repeatedtransmission numbers. In this case, some of the values of k1 to k12 maycorrespond to the same value. The repeated transmission numbers (thevalues of k1 to k12) may be configured to the UE through the higherlayer signaling or a specific value may be defined by a static rulebetween the BS and the UE.

Referring to Table 10, different repeated transmission numbers may beindicated according to the DMRS port index indicated to the UE. Forexample, when Table 10 is assumed, in a case where DMRS port 0 isindicated to the UE, the repeated transmission number corresponding tok1 may be indicated and in a case where DMRS port 1 is indicated, therepeated transmission number corresponding to k2 may be indicated.

Referring to Table 11, the repeated transmission number may be mappedand configured by the group granularity, and the same repeatedtransmission number may be mapped to DMRS antenna ports in the samegroup. As an example, in Table 11, DMRS ports 0 and 1 may be configuredas one group, and the repeated transmission number k1 may be configuredin the relevant group.

In the example of Table 11 above, each group is constituted by same DMRSport number (e.g., 2), but different DMRS port numbers may also beconfigured for each group. Even in this case, the same repeatedtransmission number may be configured in the DMRS ports in the samegroup.

Meanwhile, when multiple DMRS ports are indicated to the UE, the UE mayassume a repeated transmission number corresponding to a specific DMRSport (if repeated transmission numbers corresponding to the DMRS portsare different). For example, a repeated transmission numbercorresponding to a higher or lower index may be defined to be followed.As an example, when DMRS ports 0 and 1 are indicated, and defined tocorrespond to the lower index, the repeated transmission number of k1corresponding to DMRS port 0 may be indicated.

In addition to the proposal, a method for indicating different repeatedtransmission numbers according to the order of the DMRS port index inthe same CDM group may also be considered. That is, different repeatedtransmission numbers may be configured for the DMRS ports in the sameCDM group, respectively. This may also be interpreted as mapping aspecific repeated transmission number to the DMRS antenna port groupconstituted by the DMRS antenna ports included in different CDM groups.In other words, DMRS ports in which the same repeated transmissionnumber is configured may correspond to different CDM groups.

Table 12 shows an example in which different repeated transmissionnumbers are mapped according to the order of the DMRX port index in thesame CDM group. Table 12 is just an example for convenience of thedescription and does not limit the technical scope of the presentdisclosure.

TABLE 12 Type 1 Type 2 CDM CDM group DMRS the number group DMRS thenumber index port of repetition index port of repetition 0 0 k1 0 0 k1 1k2 1 k2 4 k3 6 k3 5 k4 7 k4 1 2 k1 1 2 k1 3 k2 3 k2 6 k3 8 k3 7 k4 9 k42 4 k1 5 k2 10 k3 11 k4

In the example of Table 12, k1 to k4 mean different repeatedtransmission numbers. In this case, some of the values of k1 to k4 maycorrespond to the same value. The repeated transmission numbers (e.g.,the values of k1 to k12) may be configured to the UE through the higherlayer signaling or a specific value may be defined by a static rulebetween the BS and the UE.

Referring to Table 12, different repeated transmission numbers may beindicated according to the order in the CDM group including the relevantDMRS ports based on the DMRS port index indicated to the UE. In otherwords, the repeated transmission numbers of k1 to k4 may beconfigured/defined, and may sequentially correspond to k1 to k4,respectively sequentially based on an indication order of the DMRS port.For example, when DMRS configuration type 1 is assumed, as DMRS port 0is indicated to the UE, the repeated transmission number correspondingto k1 may be indicated and as DMRS port 4 is indicated, the repeatedtransmission number corresponding to k3 may be indicated.

Meanwhile, when multiple DMRS ports are indicated to the UE, the UE mayassume a repeated transmission number corresponding to a specific DMRSport (if repeated transmission numbers corresponding to the DMRS portsare different). For example, a repeated transmission numbercorresponding to a higher or lower index may be defined to be followed.As an example, when DMRS ports 0 and 1 are indicated, and defined tocorrespond to the lower index, the repeated transmission number of k1corresponding to DMRS port 0 may be indicated.

When different repeated transmission numbers are indicated according tothe order of the DMRX port index in the same CDM group as in the exampledescribed above, there may be the following advantage.

When a situation of multi-user (MU)-pairing assuming scheme 3 or scheme4 is considered, it is more natural that a small number of UEs areMU-paired than a large number of UEs are MU-paired. The reason is thatMU-pairing is primarily used for a purpose of increasing a datatransmission rate by simultaneously transmitting data to multiple UEs,and to this end, precoding orthogonal to different UEs should be able tobe applied so as to prevent interference between UEs. However, in thecase of URLLC, it is preferable to minimize interference with another UEand further, in order to reduce a latency time, urgent data transmissionmay be performed, and in this case, it may be difficult and notpreferred to find a UE having precoding orthogonal for a short time.Accordingly, when it is assumed that a small number of UEs areMU-paired, different UEs may be supported through the DMRS port(s)included in different CDM groups. The reason is that it is anticipatedthat interference between DMRS ports which are multiplexed based on FDMupon channel estimation is smaller than interference between DMRS portswhich are multiplexed based on CDM.

When a situation is assumed in which different UEs are supported throughDMRS port(s) included in different CDM groups, different repeatedtransmission numbers should be able to be indicated to the respectiveUEs through the DMRS port(s) in the same CDM group. For example, whenthe maximum number of symbols of the DMRS is 1 and DMRS type 1 isassumed, DMRS ports 0 and 1 and DMRS ports 2 and 3 are included in CDMgroups 0 and 1, respectively. In this case, when DMRS ports 0 and 1correspond to the same repeated transmission number and DMRS ports 2 and3 correspond to the same repeated transmission number, there is nomethod capable of indicating different repeated transmission numbers todifferent respective UEs. Accordingly, it may be regarded that it ispreferable that different repeated transmission numbers correspond todifferent DMRS port(s) in the same CDM group. Accordingly, according tothe proposed method, different repeated transmission numbers may bemapped according to the order of the DMRS port index in the same CDMgroup, and a specific repeated transmission number may be indicatedaccording to the DMRS port index indicated to the UE.

Table 13 shows another example in which different repeated transmissionnumbers are mapped according to the order of the DMRX port index in thesame CDM group according to the method proposed in the presentdisclosure. Table 13 is just an example for convenience of thedescription and does not limit the technical scope of the presentdisclosure.

TABLE 13 Type 1 Type 2 CDM CDM group DMRS the number group DMRS thenumber index port of repetition index port of repetition 0 0 k1 0 0 k1 1k2 1 k2 4 k3 6 k3 5 k4 7 k4 1 2 k2 1 2 k2 3 k1 3 k1 6 k4 8 k4 7 k3 9 k32 4 k1 5 k2 10 k3 11 k4

When the example of Table 13 is compared with Table 12, there is afeature that repeated transmission numbers corresponding to DMRS portsincluded in CDM group 1 are different. This has a feature that whenmultiple DMRS ports are indicated to the UE, the UE may assume arepeated transmission number corresponding to a specific DMRS port (ifthe repeated transmission numbers corresponding to the DMRS ports aredifferent), and indicate different repeated transmission numbers througha combination of DMRS ports included in different CDM groups. Forexample, when a repeated transmission number corresponding to a higheror lower index is defined to be followed, different repeatedtransmission numbers may be configured through the combination of theDMRS ports included in different CDM groups.

For example, when Table 12 and the repeated transmission numbercorresponding to the small DMRS port are defined to be followed, therepeated transmission number corresponding to k1 may be indicated foreach of the combination of DMRS ports 0 and 1 and the combination ofDMRS ports 2 and 3. On the contrary, when Table 13 above is assumed, therepeated transmission number corresponding to k1 may be indicated forDMRS ports 0 and 1 and the repeated transmission number corresponding tok2 may be indicated for DMRS ports 2 and 3.

Meanwhile, in addition to matters presented in the examples of Tables10, 11, 12, and 13, the repeated transmission number corresponding toeach DMRS port may be defined differently according to the maximumsymbol number (‘maxLength’) of the DMRS configured to the UE.

Table 14 shows an example of differently defining the repeatedtransmission number corresponding to each DMRS port according to themaximum symbol number of the DMRS by assuming Table 13 above. Table 14is just an example for convenience of the description and does not limitthe technical scope of the present disclosure.

TABLE 14 maxLength = 1 maxLength = 2 Type 1 Type 2 Type 1 Type 2 the thethe the CDM number CDM number CDM number CDM number group DMRS of groupDMRS of group DRMS of group DMRS of index port repetition index portrepetition index port repetition index port repetition 0 0 k1 0 0 k1 0 0k1 0 0 k1 1 k2 1 k2 1 k3 1 k3 4 k2 6 k2 5 k4 7 k4 1 2 k2 1 2 k2 1 2 k1 12 k1 3 k1 3 k1 3 k3 3 k3 6 k2 8 k2 7 k4 9 k4 2 4 k1 2 4 k1 5 k2 5 k3 10k2 11 k4

Referring to Table 14, the repeated transmission numbers correspondingto the DMRS ports may be differently defined for a case where themaximum symbol number is 1 (i.e., maxlength=1) and a case where themaximum symbol number is 2 (i.e., maxlength=2), respectively.

In the case where the maximum symbol number is 1, the repeatedtransmission numbers corresponding to k1 and k2 may be indicated byusing DMRS ports in different CDM groups, respectively in the case of 1layer transmission and k1 and k2 may be indicated by using a (0, 1)combination and a (2, 3) combination, respectively by assuming that therepeated transmission number corresponding to the small DMRS port isfollowed in the case of 2 layer transmission. On the contrary, in thecase where the maximum symbol number is 2, the repeated transmissionnumbers corresponding to k1, k2, k3, and k4 may be indicated by usingDMRS ports in different CDM groups, respectively in the case of 1 layertransmission, and k1 and k2 may be indicated by using the (0, 1)combination and a (4, 5) combination, respectively by assuming that therepeated transmission number corresponding to the small DMRS port isfollowed, and k1 and k2 may be indicated by using the (2, 3) combinationand a (6, 7) combination, respectively.

That is, in the example, there is a feature that in the case where themaximum symbol number of the DMRS is 1, different repeated transmissionnumbers may be indicated through the DMRS port combination in differentCDM groups upon the 2 layer transmission, and in the case where themaximum symbol number is 2, different repeated transmission numbers maybe indicated through the DMRS port combination in the same CDM groupupon the 2 layer transmission.

When Table 13 and Table 14 are compared, the repeated transmissionnumbers corresponding to k1, k2, k3, and k4 may be indicated upon the 2layer transmission, and as a result, there may be an advantage in thatmore various repeated transmissions numbers may be indicated whenassuming one UE. Meanwhile, in the case of Table 14, the repeatedtransmission numbers corresponding to k1 and k2 may be indicated uponthe 2 layer transmission, but the same repeated transmission number maybe indicated in each of different CDM groups, and as a result, there maybe an advantage in that independent repeated transmission numbers may beindicated to different UEs when the MU-pairing is considered.

Since the method and/or embodiment (e.g., examples 1 to 5) may beapplied to a case where the repeated transmission is intended to beperformed in the time domain as described above, it is apparent thatscheme 3 and/or scheme 4 are/is applicable. Further, the method and/orembodiment (e.g., examples 1 to 5) may become one example applicable tothe methods of Proposal 2, and are/is not limited to the example(s).Further, it is apparent that another embodiment(s) may be applied basedon the feature of the proposed method. Further, the method and/orembodiment (e.g., examples 1 to 5) may be independently applied or mayalso be applied as a method of a form in which multiple proposed methodsare combined.

The repeated transmission number of the transmission occasion may beconfigured based on the method and/or embodiment (e.g., examples 1 to5). That is, the number of multiple transmission occasions received bythe UE may be known.

<Proposal 2-1>

The method and/or embodiment (e.g., examples 1 to 5) may also be used asa method for indicating the number of shifting symbols between differenttransmission occasions in the case of scheme 3.

In the case of scheme 3, the shifting symbol between differenttransmission occasions may mean a degree at which different transmissionoccasions are separated from each other.

FIG. 11 illustrates an example of a configuration of a shifting symbolbetween transmission occasions.

Referring to FIG. 11, according to definition 1, the shifting symbol maymean the number of symbols from a last symbol of a first transmissionoccasion up to a first symbol of a second transmission occasion. In thiscase, the shifting symbol may also be replaced with a gap symbol andexpressed. For example, the shifting symbol (gap symbol) may also beinterpreted as a gap between the first transmission occasion and thesecond transmission occasion. According to definition 2, the shiftingsymbol may mean the number of symbols from the first symbol of the firsttransmission occasion up to the first symbol of the second transmissionoccasion. In the following description, the shifting symbol will bedescribed according to definition 1. However, this is just forconvenience of the description and does not limit the scope of thepresent disclosure. Accordingly, this is applicable even to the caseaccording to definition 2.

In the case of scheme 3, a reason for requiring the shifting symbol isto support the repeated transmission to be performed in one slot evenwhen a DL/UL symbol is changed in one slot.

Table 15 shows a partial example of a slot format for a normal CP (seeTable 11.1.1-1 of TS 38.213). Referring to Table 15, symbols for DL (D)and UL (U) may be repeatedly configured in one slot.

TABLE 15 Symbol number in a slot Format 0 1 2 3 4 5 6 7 8 9 10 11 12 1346 D D D D D F U D D D D D F U 47 D D F U U U U D D F U U U U 48 D F U UU U U D F U U U U U 49 D D D D F F U D D D D F F U 50 D D F F U U U D DF F U U U 51 D F F U U U U D F F U U U U 52 D F F F F F U D F F F F F U53 D D F F F F U D D F F F F U 54 F F F F F F F D D D D D D D 55 D D F FF U U U D D D D D D

FIG. 12 illustrates an example of a transmission occasion repeatedlytransmitted in one slot. FIG. 12 is just for convenience of thedescription and does not limit the technical scope of the presentdisclosure.

FIG. 12 illustrates an example of applying the repeated transmission toa slot format corresponding to Value 49 in Table 15 above. In FIG. 12,Case 1 shows an example of the repeated transmission when the DL/ULsymbol change is not considered in one slot. In this case, a problemoccurs in that the second transmission occasion may not be transmittedwhile being overlapped with a symbol for actual UL transmission. On thecontrary, Case 2 shows an example of performing the repeatedtransmission only in a symbol for DL transmission by considering theDL/UL symbol change in one slot. When the BS intends to perform therepeated transmission by considering the DL/UL symbol change in one slotas such, the BS need to announce, to the UE, the number of shiftingsymbols between different transmission occasions.

For example, the number of shifting symbols between differenttransmission occasions may be configured based on the method and/orembodiment (e.g., examples 1 to 5). As an example, the number ofshifting symbols (gap symbols) may be configured through the higherlayer signaling. As an example, the number of shifting symbols may alsobe configured by using a field newly defined for the configuring thenumber of shifting symbols in the DCI or a conventional field (e.g., theTCI state field, the antenna port(s) field, the MCS field, the NDIfield, the RV field, etc.). As an example, the repeated transmissionnumber may be replaced with the number of shifting symbols andinterpreted in the method and/or embodiment (e.g., examples 1 to 5).

<Proposal 2-2>

The method and/or embodiment (e.g., examples 1 to 5) may also be used asa method for indicating different RV values of different transmissionoccasions in the case of scheme 2b/3.

In the case of scheme 2b/3, in respect to different RV values ofdifferent transmission occasions, a value of a first RV field indicatedto the UE may indicate an RV value of the first transmission occasion,and in respect to the RV value of the second transmission occasion, adifference value and/or a value of actual RV and/or RV combinationrelated indication information may be separately signaled based on thevalue indicated as the first RV field. The following method may becomeone example of a method for indicating the difference value of the RVvalue and/or the actual RV value and/or the RV combination relatedindication information.

Hereinafter, proposed is a method for indicating RV related informationfor each transmission occasion in time domain repetition transmission.For convenience of description, an example of the case where two TRPs(e.g., TRP 1 and TRP 2) perform coordinated transmission is primarilydescribed, but does not limit the scope of the present disclosure.Accordingly, the method may be applied even to a case where three ormore TRPs perform the coordinated transmission, of course. Further, asingle DCI based M-TRP operation is assumed and described.

In the example of Proposal 2-2, it is assumed that the firsttransmission occasion corresponds to TRP 1 and the second transmissionoccasion corresponds to TRP 2. Here, the different transmissionoccasions may be interpreted as different (transmission) resourcedomains corresponding to different TRPs.

In respect to the method and/or embodiments (e.g., examples 1 to 5),different RV values may be indicated for the transmission resourceregions corresponding to different TRPs. This is because independentencoded bits may correspond to respective transmission resource regionscorresponding to different TRPs. When different RV values may beindicated to the independent encoded bits corresponding to differentTRPs as such, there may be an advantage in that a most appropriate RVcombination may be indicated according to a channel environment.

For example, when there is a path loss difference between differentchannels corresponding to different TRPs, more parity bits may betransmitted by indicating a combination of self decodable RV (e.g., 0and/or 3) and non-self decodable RV (e.g., 1 and/or 2 and/or 3), androbust channel coding may be applied. On the contrary, when the pathloss difference between different channels corresponding to differentTRPs is large or a blockage environment is considered, the selfdecodable RV is mapped to all of the different TRPs to receive selfdecodable encoded bits even in one TRP among different TRPs, therebyenhancing a reception capability of the UE.

In the present disclosure, the ‘self decodable RV’ may mean a decodableRV value by receiving single encoded bits due to a low effective codingrate, and the ‘non-self decodable RV’ may mean an RV value which isdifficult to decode by receiving the single encoded bits due to a higheffective coding rate. In the present disclosure, the ‘blockageenvironment’ may mean a channel environment in which the reception SNRfrom the relevant TRP is very low because a channel from a specific TRPbecomes weak. The ‘encoded bits’ mentioned in the present disclosure mayalso be referred to as codeword (CW).

The following method may be applied in order to indicate different RVvalues to respective encoded bits corresponding to the transmissionresource regions corresponding to different TRPs. Hereinafter, a methodfor configuring the RV value corresponding to each transmission occasionwill be described in detail.

Method 1: The RV value (e.g., a first RV value) may be indicated throughthe RV field of the DCI and a difference value from the RV value (e.g.,the first RV value) may be indicated. Method 1 is a method forindicating an actual different value (e.g., alpha) compared with x whenit is assumed that the RV value (e.g., the first RV value) indicatedthrough the first RV field is x. For example, when X is indicated by theRV value based on the first RV field and the alpha is indicated, the RVvalue of the second transmission occasion may be determined as X+alpha.For example, when it is assumed that the x is 0, if the difference valueindicates 3, the RV value of the first transmission occasion correspondsto 0 and the RV value of the second transmission occasion corresponds to3.

Method 2: A method for indicating a difference value in the relevantorder after defining a specific RV order may be considered. For Method2, first, multiple RV values need to be defined in a specific order. Tothis end, the RV order used for retransmission may be used. For example,the order of the RV values may be defined in the order of 0, 2, 3,and 1. In addition, when the RV value indicated through the first RVfield is x, what numberth RV value the relevant RV value is may becyclically indicated based on x. For example, when 0 is indicated as theRV value of the first transmission occasion and 3 is indicated as thedifference value, the RV value of the second transmission occasioncorresponds to 1 positioned in an order behind 0 by three steps.

Method 3: Multiple RV values (e.g., the first RV value and the second RVvalue) may be indicated through the RV field of the DCI. That is,another RV value (e.g., the second RV value) to be actually applied maybe indicated according to Method 3 in addition to the RV value (e.g.,the first RV value) indicated through the first RV field.

Method 4: Method for Indicating RV Combination

A method for indicating different RV values to the transmission resourceregions corresponding to different TRPs may be considered. That is, amethod for indicating the RV combination for different transmissionsoccasions (e.g., the first transmission occasion/the second transmissionoccasion) may also be considered. Here, the different transmissionoccasions may be interpreted as different (transmission) resourcedomains corresponding to different TRPs.

An RV value for the encoded bits transmitted through a specific(transmission) resource region corresponding to a specific TRP amongmultiple TRPs, and an RV value for encoded bits transmitted through aspecific resource region corresponding to other TRPs other than thespecific TRP may be fixed/configured (e.g., RRC signaling and/or MAC-CEsignaling) to a specific value (i.e., default value, e.g., 0).

For example, when two TRPs are configured, an RV value for one TRP(e.g., TRP 1) may be dynamically indicated through the RV field in theDCi, and an RV value for the other TRP (e.g., TRP 2) other than therelevant TRP may be fixed to a specific value or configured through thehigher layer signaling. Further, for example, when three or more TRPsare configured, an RV value for one TRP among multiple TRPs may bedynamically indicated through the RV field in the DCI, and an RV valuefor a TRP(s) other than the one specific TRP may be fixed to a specificvalue (s) or configured through the higher layer signaling. In thiscase, the specific value (s) may be fixed/configured to the same valuefor all TRP(s), or fixed/configured to an individual value for eachTRP(s).

As an example, in the proposal, the ‘specific resource regioncorresponding to the specific TRP’ may be a resource regioncorresponding a first TCI state (e.g., TCI state #0) and/or CW #0 and/ora first TB field. The ‘first’ may become one example, and may bereplaced with another specific value such as second, etc. That is, thespecific resource region corresponding to the specific TRP may be aresource region corresponding to a specific TCI state, a specific CW,and/or a specific TB field. The relevant specific value may be fixed asa (pre)-static value between the BS and the UE or the BS may alsoconfigure, to the UE, the relevant specific value through the higherlayer signaling (e.g., RRC/MAC-CE) and/or DCI signaling. When theproposal is applied, an example of an RV combination which may beindicated to each of TRPs 1 and 2, i.e., corresponds to the encoded bitscorresponding to the resource region corresponding to each TRP may beshown in Table 16.

Table 16 shows an example of an RV combination corresponding to eachTRP. In the example of Table 16, the RV value of TRP 2 may befixed/configured to 0 or another value (e.g., 1/2/3). As an example, theanother value may be configured through the higher layer signaling.

TABLE 16 RV value indicated TRP 1 (e.g., for TRP 2 (e.g., for the by RVfield in DCI the first TCI state) second TCI state) 0 0 0 or higherlayer signaled value 1 1 0 or higher layer signaled value 2 2 0 orhigher layer signaled value 3 3 0 or higher layer signaled value

When Method 4 described is applied, the following advantage may beobtained. First, different RV combinations for different TRPs may beindicated through a single specific RV field in the DCI. Second, aspecific TRP among different TRPs may continuously transmit the encodedbits of the self decodable RV. As an example, when Method 4 above isapplied, in the case of an environment in which the path loss differencebetween different channels corresponding to different TRPs is small, acombination of the self decodable RV and the non-self decodable RV maybe indicated. On the contrary, in the case of an environment in whichthe path loss difference is large or blockage may occur, the combinationof the self decodable RV and the self decodable RV may be indicated.Through this, there is a technical effect capable of dynamicallyindicating a robust (i.e., optimized) RV combination according to achannel environment.

Further, jointly with Method 4 described above, a method for indicatingthe RV combination constituted by multiple RV values through the RVfield in the DCI may also be considered. When such a method is applied,there may be a feature that the RV field may correspond to multiple RVvalues differently from a case where the RV field corresponds to aspecific RV value in a conventional standard.

Table 17 illustrates an example in which a combination of multiple RVvalues is indicated/configured. Table 17 is just an example forconvenience of the description and does not limit the technical scope ofthe present disclosure.

TABLE 17 RV value ndicated TRP 1 (e.g., for TRP 2 (e.g., for the by RVfield in DCI the first TCI state) second TCI state) 0 0 0 1 0 3 2 0 2 31 3

Referring to Table 17, the RV value (or index) may be indicted throughthe RV field in the DCI, and multiple RV values may be mapped for eachRV value. In other words, a mapping relationship of multiple RV valuesmay be pre-defined for each codepoint of the RV field of the DCI, andthe RV value corresponding to each TRP may determined based on a valueindicated by the DCI.

As in the example of Table 17, when the method for indicating the RVcombination constituted by multiple RV values is applied, there may be afeature that the value indicted through the RV field is different fromthe RV value to be actually applied. The RV combination corresponding toeach RV field may be defined as a static value between the BS and theUE, and a specific RV combination may be configured to the UE throughthe higher layer signaling and/or the DCI signaling.

Method 5: Method for Indicating Mapping Relationship Between RVCombination and TRP

According to Method 4 described above, there may be an advantage in thatdifferent RV values may be indicated to different encoded bitscorresponding to different TRPs. The ‘different encoded bitscorresponding to different TRPs’ may be interpreted as different encodedbits corresponding to different TCI states. Meanwhile, Method 4 abovehas a feature that the RV combination indicated through the specific RVfield is fixed in a specific order. For example, according to Method 4,3 may be indicated to encoded bits corresponding to the first TRPthrough the RV field in the DCI and 0 may be indicated to encoded bitscorresponding to the second TRP, but contrary to this, 0 and 3 may notbe indicated.

The limitation may have a disadvantage in that when the BS indicates theRV order differently according to the channel state between the TRP andthe UE, the combination of the TCI states is the same, but respectivecodepoints having a different order should be defined in the TCI statefield, and as a result, efficiency of the TCI state field deteriorates.For example, when each of codepoint 0 corresponding to {TCI state A, TCIstate B} of the TCI field and codepoint 1 corresponding to {TCI state B,TCI state A} is defined, combinations of {2, 0} and {0, 2} may beindicated to encoded bits corresponding to TCI state A and encoded bitscorresponding to TCI state B through codepoint 0 and codepoint 1,respectively (in Method 4, it is assumed that 2 is indicated in the RVfield).

A method capable of changing an order (or the order o the TCI state) ofTRPs corresponding to different RVs may be considered in order toovercome the disadvantage.

Method 5-1) Specific mapping order related information may be indicatedbased on the index of the CDM group including the DMRS port(s) indicatedthrough the antenna port(s) field in the DCI (e.g., see an antenna portrelated table of DCI format 1-1 described in section 4.1.7). That is,different mapping orders may be indicated according to the index of theCDM group. As an example, when the indicated CDM group index is 0, i.e.,when the indicated DMRS port(s) is included in CDM group 0, the first RVvalue in the RV combination (e.g., the RV combination configured by theBS as in Method 4) indicated to the UE may be applied to the encodedbits corresponding to the first TCI state and the second RV value may beapplied to the encoded bits corresponding to the second TCI state. Onthe contrary, when the indicated CDM group index is 1, i.e., when theindicated DMRS port(s) is included in CDM group 1, the first RV value inthe RV combination indicated to the UE may be applied to the encodedbits corresponding to the second TCI state and the second RV value maybe applied to the encoded bits corresponding to the first TCI state.Alternatively, the opposite case is also possible.

Method 5-2) A Modulation and Coding Scheme (MCS)/New Data Indicator(NDI) field for a second transport block (TB) of the DCI may be used.For example, different mapping orders may be indicated through 1 bit ofthe MCS/NDI field

Method 5-3) Specific mapping order related information may be indicatedbased on the DMRS antenna port(s) index through the antenna port(s)field in the DCI.

For example, the specific mapping order related information may bemapped to a specific DRMS antenna port or DMRS antenna ports (DMRSantenna port group).

Table 18 shows an example of mapping specific mapping order relatedinformation to a specific DMRS antenna port and Table 19 shows anexample of mapping the specific mapping order related information to aspecific DMRS antenna port group. The DMRS antenna port group may beconstituted by multiple DMRS antenna ports.

TABLE 18 Type 1 Type 2 Mapping order Mapping order between TCI betweenTCI DMRS states and DMRS states and port RV values port RV values 0 k1 0k1 1 k2 1 k2 2 k3 2 k3 3 k4 3 k4 4 k5 4 k5 5 k6 5 k6 6 k7 6 k7 7 k8 7 k88 k9 9 k10 10 k11 11 k12

TABLE 19 Type 1 Type 2 Mapping order Mapping order between TCI betweenTCI DMRS states and DMRS states and port RV values port RV values 0 k1 0k1 1 k1 1 k1 2 k2 2 k2 3 k2 3 k2 4 k3 4 k3 5 k3 5 k3 6 k4 6 k4 7 k4 7 k48 k5 9 k5 10 k6 11 k6

In the examples of Table 18 and Table 19, k1 to k12 may mean differentmapping order related information. In this case, some of the values ofk1 to k12 may correspond to the same mapping order. The mapping ordercorresponding to k1 to k12 above may be configured to the UE through thehigher layer signaling or a specific mapping order may be defined by astatic rule between the BS and the UE.

Referring to Table 18, different mapping order related information maybe mapped to different DMRS antenna ports. Further, referring to Table19, different mapping order related information may be mapped by a groupgranularity constituted by multiple DMRS antenna ports. In the examplesof Table 18 and Table 19, different mapping order related informationmay be indicated according to the DMRS port index indicated to the UE.For example, when Table 19 is assumed, when DMRS port 0 is indicated tothe UE, the mapping order related information (e.g., the first RV ismapped to the first TCI state and the second RV is mapped to the secondTCI state) corresponding to k1 may be indicated and when DRMS port 2 isindicated, the mapping order related information (e.g., the second RV ismapped to the first TCI state and the first RV is mapped to the secondTCI state) corresponding to k2 may be indicated.

Meanwhile, when multiple DMRS ports are indicated to the UE, the UE mayassume mapping order related information corresponding to a specificDRMS port. For example, mapping order related information correspondingto a higher or lower index may be defined to be followed. As an example,when DMRS ports 0 and 1 are indicated, and defined to correspond to thelower index, the mapping order related information corresponding to k1corresponding to DMRS port 0 may be indicated.

Further, different mapping order information may also be indicatedaccording to the DMRS port index in the same CDM group. In other words,specific mapping order related information may be mapped to a DMRSantenna port group constituted by the DMRS antenna ports included indifferent CDM groups.

Table 20 shows an example of indicating different mapping order relatedinformation according to the order of the DMRS port index by a CDM groupgranularity.

TABLE 20 Type 1 Type 2 Mapping order Mapping order CDM between TCI CDMbetween TCI group DMRS states and group DMRS states and index port RVvalues index port RV values 0 0 k1 0 0 k1 1 k2 1 k2 4 k3 6 k3 5 k4 7 k41 2 k1 1 2 k1 3 k2 3 k2 6 k3 8 k3 7 k4 9 k4 2 4 k1 5 k2 10 k3 11 k4

In the example of Table 20, k1 to k4 mean different mapping orderrelated information. In this case, some of the values of k1 to k4 maycorrespond to the same mapping order. The mapping order relatedinformation may be configured to the UE through the higher layersignaling or a specific mapping order may be defined by a static rulebetween the BS and the UE.

Referring to Table 20, the different mapping order related informationmay be mapped according to the DMRS port index in the same CDM group. Inother words, the different mapping order related information may beindicated according to the order in the CDM group including the relevantDMRS ports based on the DMRS port index indicated to the UE. Forexample, when DMRS configuration type 1 is assumed, in a case where DMRSport 0 is indicated to the UE, mapping order related informationcorresponding to k1 may be indicated and in a case where DMRS port 4 isindicated, mapping order related information corresponding to k3 may beindicated.

Meanwhile, when multiple DMRS ports are indicated to the UE, the UE mayassume mapping order related information corresponding to a specificDRMS port. For example, mapping order related information correspondingto a higher or lower index may be defined to be followed. As an example,when DMRS ports 0 and 1 are indicated, and defined to correspond to thelower index, the mapping order related information corresponding to k1corresponding to DMRS port 0 may be indicated.

Method 6:

In Method 5 and Method 5-1/5-2/5-3, proposed is a method capable ofindicating different mapping orders for a TCI state combinationconstituted by multiple TCI states defined in a specific codepoint ofthe TCI state field in the DCI and an RV combination indicated throughthe RV field. For example, when {TCI state A, TCI state B} is indicatedthrough the specific codepoint of the TCI state field and {RV0, RV2} isindicated through the RV field, a mapping relationship between {TCIstate A-RV0, TCI state B-RV2} or {TCI state A-RV2, TCI state B-RV0} maybe determined through the CDM group index. That is, in this case, inorder to apply different mapping orders between TCI states and RVvalues, additional information (e.g., CDM group index, DMRS port index,etc.) may be required.

Unlike this, a method for defining an RV combination constituted by thesame RC values and having different orders in the RV field may beapplied in addition to the proposed scheme. That is, a combinationautonomously having different mapping orders between the TCI states andthe RV values in the RV field may be configured/defined. In addition, itis apparent that even when schemes of Method 5 and Method 5-1/5-2/5-3described above are not applied, the relevant method may be applied as amethod for indicating different RVs in resource regions corresponding todifferent TCI states.

Table 21 shows an example of a method for indicating the RV combinationaccording to Method 6 of the present disclosure.

TABLE 21 Value of rvid Value of rvid Value of the to be applied to beapplied redundancy to transmission to transmission version fieldoccasion with the occasion with the (order may be first (or second)second (or first) changed) TCI state TCI state 00 0 0 01 0 2 10 2 0 11 13

In the example of the RV combination, RV combinations corresponding to01 and 10 which are values of the RV field are {0, 2} and {2, 0},respectively. As an example, an RV combination of {x, 0} and {0, x}(e.g., x=one value of {1, 2, 3}) in the RV field may bedefined/configured. The combination has a feature that the combinationis constituted by the same RV values and has different orders. When theRV combinations having the feature are jointly defined in the RV field,the BS has an advantage of being capable of indicating RV combinationsof different orders through the RV field according to channel situationsof different TRPs. That is, the BS has an advantage of being capable ofconfiguring and/or indicating an optimized RV combination by determiningand considering the channel situation of each TRP. For example, when TRPA has a better channel (e.g., higher CQI) in respect to TRP A/B (e.g.,TRP A is mapped to the first TCI state and TRP 2 is mapped to the secondTCI state), RV0 which is self-decodable RV may be indicated for TRP Aand RV2 may be indicated for TRP B.

There may be an RV combination of Table 22 as another example having thesame purpose.

TABLE 22 Value of rvid Value of rvid Value of the to be applied to beapplied redundancy to transmission to transmission version fieldoccasion with the occasion with the (order may be first (or second)second (or first) changed) TCI state TCI state 00 0 0 01 0 2 10 3 0 11 13

In the example of the RV combination, RV combinations corresponding to01 and 10 which are values of the RV field are {0, 2} and {3, 0},respectively. As an example, an RV combination of {x, 0} and {0, y}(e.g., x=one value of {1, 2, 3} and y=one value of [1, 2, 3] other thanthe x) in the RV field may be defined/configured. A difference from theprevious RV combination is that an RV combination corresponding to 10 isnot {2, 0} but {3, 0}. The example may have an advantage of beingcapable of changing the order of the TRP in which RV0 which is theself-decodable RV is mapped and an advantage of being capable ofdefining more various RV combinations.

Another example of the RV combination suitable for applying the schemesof Method 5 and Method 5-1/5-2/5-3 in addition to the proposal is shownin Table 23.

TABLE 23 Value of rvid Value of rvid Value of the to be applied to beapplied redundancy to transmission to transmission version fieldoccasion with the occasion with the (order may be first (or second)second (or first) changed) TCI state TCI state 00 0 0 01 2 2 (or 1 or 3)(or 1 or 3) 10 0 2 11 1 3 (or 3) (or 1)

A reason why the RV combination is suitable is as follows. First, the RVcombination may be defined by considering a blockage environment inwhich large path loss may occur radically and a non-blockage environmentin which the blockage may not be considered. Accordingly, the (0, 0)combination should be defined to receive the self-decodable RV (e.g.,RV0) from a TRP in which the blockage does not occur even when theblockage occurs by considering the blockage environment. Meanwhile, the(0, 2) combination should be defined by considering the non-blockageenvironment. The reason is that it is anticipated that the (0, 2)combination may have a lower effective channel coding rate due toincrement redundancy to have an excellent capability in mostenvironments. The reason why RV combinations (2, 2) and (1, 3) should bedefined based on the RV combinations is that retransmission isconsidered. In the case of the (0, 0) combination, RV0 and RV2 arereceived through the TRP in which the blockage does not occur eventhough the blockage occurs in a specific TRP of two TRPs to reduce theeffective channel coding rate through the (2, 2) combination uponretransmission Although it is assumed that (RV0, RV0) and (RV2, RV2) aredefined by applying RV0 and RV2 in the example, RV2 may be replaced withRV1 or RV3 in the example, and even in this case, a similar feature anda similar effect may be obtained (e.g., (2, 2) may be (1, 1) or (3, 3)in Table 23 above).

Meanwhile, in the case of the (0, 2) combination considering thenon-blockage environment, the UE may receive data for all RVs and lowerthe effective channel coding rate as possible through the (1, 3)combination upon retransmission. The order of RV1 and RV3 is applied inthe example, and it is also possible to define an order of being mappedto different TCI state as an order of RV3 and RV1. Further, the (0, 2)combination considering the non-blockage environment may be replacedwith a combination of (0, x) and defined, and in this case, the RVcombination for retransmission in the non-blockage environment may bedefined as (y, z) value other than the (0, x). In the example, x maybecome one value of 1, 2, and 3, and y and z may correspond to valueswhich are not redundant, respectively among values other than 0 and x.For example, when a combination indicated by Value “10” is (0, 1), acombination indicated by Value “11” may be (2, 3) or (3, 2).Alternatively, for example, when the combination indicated by Value “10”is (0, 3), the combination indicated by Value “11” may be (1, 2) or (2,1).

The example of the specific RV combination may be an example, and it isapparent that it is possible to apply the feature of the proposed schemeto RV combinations constituted by using other RV values.

Further, in the present disclosure an RV value, RV value information, orRV value related information or RV value indication information may beinterpreted/used as an actual RV difference value/a difference value inthe order/an actual RV value/RV combination related indicationinformation.

<Proposal 2-3>

In Proposal 2-1 described above, the method for indicating the number ofshifting symbols between different transmission occasions is described.Further, in Proposal 2-2 described above, the method for indicatingdifferent RV values of different transmission occasions is described.The method and/or embodiment (e.g., examples 1 to 5) of Proposal 2described above may be used in order to indicate the number of shiftingsymbols and/or the RV value related information (e.g., the differencevalue of the RV value, the actual RV value, the RV combination relatedindication information, etc.).

The BS may configure values applicable to the number of shifting symbolsand/or the RV value related information to the UE through the higherlayer signaling (e.g., RRC/MAC CE). And/or, a candidate value(s) for thenumber of shifting symbols and/or the RV value related information whichare fixed and/or (pre)-promised between the BS and the UE may bedefined, and the BS may implicitly or explicitly indicate a specificvalue among the candidate value(s) for the number of shifting symbolsand/or the RV value related information which may be indicated to the UEthrough a specific field in the DCI.

In the proposal, the candidate value may mean some/all values which theBS configures to the UE through the higher layer signaling based on apre-configured/defined promise/rule/condition among the number ofshifting symbols and/or the RV value related information. Further, thespecific field in the DCI may be a field newly defined for indicatingthe number of shifting symbols and/or the RV value related informationor a conventional field (e.g., the TCI state field, the antenna port(s)field, the MCS field, the NDI field, the RV field, etc.).

For example, when the number of shifting symbols and/or the RV valuerelated information are/is configured to the UE through the higher layersignaling, it may be assumed that {1, 2, 3, 4} are defined as the numberapplicable of shifting symbols. Some (e.g., {1, 2}) of the values as thenumber of shifting symbols and/or the RV value related information maybe configured to the UE through the higher layer signaling. For example,a specific value of the candidate value(s) (e.g., {1, 2}) may beindicated through the specific field in the DCI.

For example, as an example of the specific field in the DCI, the antennaport(s) field may be used. A specific shifting symbol number and/or RVvalue related information may be indicated based on the index of the CDMgroup indicated through the antenna port(s) field. As an example, whenthe indicated CDM group index is 0 (i.e., when the indicated DMRSport(s) is included in CDM group 0), a smaller shifting symbol numberamong the candidate values for the shifting symbol number and/or smallerRV value related information among the candidate values for the RV valuerelated information may be indicated. When the indicated CDM group indexis 1 (i.e., when the indicated DMRS port(s) is included in CDM group 1),a larger shifting symbol number among the candidate values for theshifting symbol number and/or larger RV value related information amongthe candidate values for the RV value related information may beindicated.

As a specific example, when the candidate value for the shifting symbolnumber such as {1, 2} is configured, 1 shift symbol may be indicated inthe case of indicating CDM group index 0 and 2 shifting symbols may beindicated in the case of indicating CDM group index 1. Alternatively,the opposite case is also possible.

As another example, a Modulation and Coding Scheme (MCS)/New DataIndicator (NDI)/Redundancy Version (RV) field for a second transportblock (TB) in the DCI may be used. For example, different shiftingsymbol numbers and/or RV value related information may be mapped to acodepoint corresponding to the MCS/NDI/RV field for the second TB, andthe BS may indicate, to the UE, a specific shifting symbol number and/orRV value related information through the relevant field.

As another example, as an example of the specific field in the DCI, theantenna port(s) field may be used. For example, a specific shiftingsymbol number and/or RV value related information may be indicated basedon the DMRS antenna port(s) index indicated through the antenna port(s)field.

As an example, the specific shifting symbol number and/or RV valuerelated information may be mapped to specific DRMS antenna ports or DMRSantenna ports (DMRS antenna port group).

Table 24 shows an example in which different shifting symbol numbersand/or RV value related information are mapped to different DMRS antennaports. Table 25 shows an example in which different shifting symbolnumbers and/or RV value related information are mapped by a groupgranularity constituted by multiple DMRS antenna ports.

TABLE 24 Type 1 Type 2 the number of the number of DMRS shifting symbolsDMRS shifting symbols port and/or RV value port and/or RV value 0 k1 0k1 1 k2 1 k2 2 k3 2 k3 3 k4 3 k4 4 k5 4 k5 5 k6 5 k6 6 k7 6 k7 7 k8 7 k88 k9 9 k10 10 k11 11 k12

TABLE 25 Type 1 Type 2 DMRS the number DMRS the number port ofrepetition port of repetition 0 k1 0 k1 1 k1 1 k1 2 k2 2 k2 3 k2 3 k2 4k3 4 k3 5 k3 5 k3 6 k4 6 k4 7 k4 7 k4 8 k5 9 k5 10 k6 11 k6

In Tables 24 and Table 25, k1 to k12 may mean different shifting symbolnumbers and/or RV value related information. In this case, some of thevalues of k1 to k12 may correspond to the same value. The valuescorresponding to k1 to k12 above may be configured to the UE through thehigher layer signaling or specific values may be defined by a staticrule between the BS and the UE.

In the examples of Table 24 and Table 25, different shifting symbolnumbers and/or RV value related information may be indicated accordingto the DMRS port index indicated to the UE. For example, referring toTable 25, when DMRS port 0 is indicated to the UE, the shifting symbolnumber and/or RV value related information corresponding to k1 may beindicated and when DMRS port 2 is indicated, the shifting symbol numberand/or RV value related information corresponding to k2 may beindicated.

Meanwhile, when multiple DMRS ports are indicated to the UE, the UE mayassume a shifting symbol number and/or RV value related informationcorresponding to a specific DRMS port. For example, a shifting symbolnumber and/or RV value related information corresponding to a higher orlower index may be defined to be followed. As an example, when DMRSports 0 and 1 are indicated, and defined to correspond to the lowerindex, the shifting symbol number and/or RV value related informationcorresponding to k1 corresponding to DMRS port 0 may be indicated.

In addition to the proposal, a method for indicating different shiftingsymbol numbers and/or RV value related information may be indicatedaccording to the order of the DMRX port index in the same CDM group. Inother words, a specific shifting symbol number and/or RV value relatedinformation may be mapped to a DMRS antenna port group constituted bythe DMRS antenna ports included in different CDM groups.

Table 26 shows an example of mapping different shifting symbol numbersand/or RV value related information according to the order of the DMRSport index in the same CDM group.

TABLE 26 Type 1 Type 2 the number the number of shifting of shifting CDMsymbols CDM symbols group DMRS and/or RV group DMRS and/or RV index portvalue index port value 0 0 k1 0 0 k1 1 k2 1 k2 4 k3 6 k3 5 k4 7 k4 1 2k1 1 2 k1 3 k2 3 k2 6 k3 8 k3 7 k4 9 k4 2 4 k1 5 k2 10 k3 11 k4

In Table 26, k1 to k4 mean different shifting symbol numbers and/or RVvalue related information. In this case, some of the values of k1 to k4may correspond to the same value. The shifting symbol number and/or RVvalue related information may be configured to the UE through the higherlayer signaling or a specific value may be defined by a static rulebetween the BS and the UE.

Referring to Table 26, different shifting symbol numbers and/or RV valuerelated information may be indicated according to the order in the CDMgroup including the relevant DMRS ports based on the DMRS port indexindicated to the UE. For example, in the case of assuming DRMSconfiguration type 1, when DMRS port 0 is indicated to the UE, theshifting symbol number and/or RV value related information correspondingto k1 may be indicated and when DMRS port 4 is indicated, the shiftingsymbol number and/or RV value related information corresponding to maybe indicated.

Meanwhile, when multiple DMRS ports are indicated to the UE, the UE mayassume a shifting symbol number and/or RV value related informationcorresponding to a specific DRMS port. For example, a shifting symbolnumber and/or RV value related information corresponding to a higher orlower index may be defined to be followed. As an example, when DMRSports 0 and 1 are indicated, and defined to follow the shifting symbolnumber and/or RV value related information corresponding to the lowerindex, the shifting symbol number and/or RV value related informationcorresponding to k1 corresponding to DMRS port 0 may be indicated.

As in the example of Table 26, when different shifting symbol numbersand/or RV value related information are indicated according to the orderof the DMRX port index in the same CDM group, there may be the followingadvantage.

When a situation of multi-user (MU)-pairing assuming scheme 2b or scheme3 is considered, it is more natural that a small number of UEs areMU-paired than a large number of UEs are MU-paired. The reason is thatMU-pairing is primarily used for a purpose of increasing a datatransmission rate by simultaneously transmitting data to multiple UEs,and to this end, precoding orthogonal to different UEs should be able tobe applied so as to prevent interference between UEs. However, in thecase of URLLC, it is preferable to minimize interference with another UEand further, in order to reduce a latency time, urgent data transmissionmay be performed, and in this case, it may be difficult and notpreferred to find a UE having precoding orthogonal for a short time.Accordingly, when it is assumed that a small number of UEs areMU-paired, different UEs may be supported through the DMRS port(s)included in different CDM groups. The reason is that it is anticipatedthat interference between DMRS ports which are multiplexed based on FDMupon channel estimation is smaller than interference between DMRS portswhich are multiplexed based on CDM.

When a situation is assumed in which different UEs are supported throughDMRS port(s) included in different CDM groups, different shifting symbolnumbers and/or RV value related information should be able to beindicated to the respective UEs through the DMRS port(s) in the same CDMgroup.

For example, when the maximum number of symbols of the DMRS is 1 andDMRS type 1 is assumed, DMRS ports 0 and 1 and DMRS ports 2 and 3 areincluded in CDM groups 0 and 1, respectively. In this case, when DMRSports 0 and 1 correspond to the same shifting symbol number and/or RVvalue related information and DRMS ports 2 and 3 correspond to the sameshifting symbol number and/or RV value related information, there is nomethod capable of indicating different shifting symbol numbers and/or RVvalue related information to different respective UEs. Accordingly, itmay be regarded that it is preferable that different shifting symbolnumbers and/or RV value related information correspond to different DMRSport(s) in the same CDM group.

To this end, according to the proposed method, different shifting symbolnumbers and/or RV value related information may be mapped according tothe order of the DMRS port index in the same CDM group, and a specificshifting symbol number and/or RV value related information may beindicated according to the DMRS port index indicated to the UE.

Table 27 shows another example of mapping different shifting symbolnumbers and/or RV value related information according to the order ofthe DMRS port index.

TABLE 27 Type 1 Type 2 the number the number of shifting of shifting CDMsymbols CDM symbols group DMRS and/or RV group DMRS and/or RV index portvalue index port value 0 0 k1 0 0 k1 1 k2 1 k2 4 k3 6 k3 5 k4 7 k4 1 2k2 1 2 k2 3 k1 3 k1 6 k4 8 k4 7 k3 9 k3 2 4 k1 5 k2 10 k3 11 k4

Table 27 has a feature in that Table 27 is different from Table 26 interms of shifting symbol numbers and/or RV value related informationcorresponding to DMRS ports included in CDM group 1. This has a featurein that when multiple DMRS ports are indicated to the UE, in a casewhere a shifting symbol number and/or RV value related informationcorresponding a small or large DRMS port is defined to be followed,different shifting symbol numbers and/or RV value related informationmay be indicated through DMRS port combinations included in differentCDM groups.

As an example, when Table 26 and the shifting symbol number and/or RVvalue related information corresponding to the small DMRS port, theshifting symbol number and/or RV value related information correspondingto k1 may be indicted for each of the combination of DMRS ports 0 and 1and the combination of DMRS ports 2 and 3. On the contrary, when Table27 is assumed, the shifting symbol number and/or RV value relatedinformation corresponding to k1 for DRMS ports 0 and 1 and k2 for DMRSports 2 and 3 may be indicated.

Meanwhile, in addition to matters presented in the examples of Tables24, 25, 26, and 27, the shifting symbol number and/or RV value relatedinformation corresponding to each DMRS port may be defined differentlyaccording to the maximum symbol number (e.g., ‘maxLength’) of the DMRSconfigured to the UE.

Table 28 shows an example of differently defining the shifting symbolnumber and/or RV value related information corresponding to each DMRSport according to the maximum symbol number of the DMRS based on Table27.

TABLE 28 maxLength = 1 Type 1 Type 2 the number the number of shiftingof shifting CDM symbols CDM symbols group DMRS and/or RV group DMRSand/or RV index port value index port value 0 0 k1 0 0 k1 1 k2 1 k2 4 k36 k3 5 k4 7 k4 1 2 k2 1 2 k2 3 k1 3 k1 6 k4 8 k4 7 k3 9 k3 2 4 k1 5 k210 k3 11 k4 maxLength = 2 Type 1 Type 2 the number the number ofshifting of shifting CDM symbols CDM symbols group DMRS and/or RV groupDMRS and/or RV index port value index port value 0 0 k1 0 0 k1 1 k2 1 k24 k3 6 k3 5 k4 7 k4 1 2 k2 1 2 k2 3 k1 3 k1 6 k4 8 k4 7 k3 9 k3 2 4 k1 5k2 10 k3 11 k4

Referring to Table 28, the shifting symbol number and/or RV valuerelated information corresponding to the DMRS port may be differentlydefined according to the maximum symbol number of the DMRS. For example,when the maximum symbol number is 1 (i.e., maxLength=1), the shiftingsymbol numbers and/or RV value related information corresponding to k1and k2, respectively may be indicated b using DMRS ports withindifferent CDM group in the case of 1 layer transmission. Further, in thecase of 2 layer transmission, when it is assumed that a repeatedtransmission number corresponding to the small DMRS port is followed, k1and k2 may be indicated by using the (0, 1) combination and the (2, 3)combination, respectively. On the contrary, in the case where themaximum symbol number is 2 (i.e., maxLength=2), the shifting symbolnumbers and/or RV value related information corresponding to k1, k2, k3,and k4 may be indicated by using DMRS ports in different CDM groups,respectively in the case of the 1 layer transmission, and k1 and k2 maybe indicated by using the (0, 1) combination and the (4, 5) combination,respectively by assuming that the repeated transmission numbercorresponding to the small DMRS port is followed, and k1 and k2 may beindicated by using the (2, 3) combination and the (6, 7) combination,respectively in the case of the 2 layer transmission.

That is, in the example, there is a feature that in the case where themaximum symbol number of the DMRS is 1, different shifting symbolsnumbers and/or RV value related information may be indicated through theDMRS port combination in different CDM groups upon the 2 layertransmission, and in the case where the maximum symbol number is 2,different shifting symbols numbers and/or RV value related informationmay be indicated through the DMRS port combination in the same CDM groupupon the 2 layer transmission.

Table 27 may have an advantage in that since the shifting symbolsnumbers and/or RV value related information corresponding to k1, k2, k3,and k4 may be indicated upon the 2 layer transmission, more variousshifting symbol numbers and/or RV value related information may beindicated by assuming one UE.

Table 28 may have an advantage in that since the shifting symbol numbersand/or RV value related information corresponding to k1 and k2 may beindicated, but the same shifting symbol number and/or RV value relatedinformation may be indicated within each of different CDM groups, uponthe 2 layer transmission, independent shifting symbol numbers and/or RVvalue related information may be indicated to different UEs whenconsidering the MU-pairing.

<Proposal 3>

Proposal 3 in the present disclosure proposes a method forconfiguring/indicating a transmission resource region in repeatedtransmission in the time domain.

DCI (e.g., DCI format 1_1, etc.) includes one field, i.e., a ‘Timedomain resource assignment’ for time domain resource scheduling.Accordingly, when the repeated transmission is intended to be performedin the time domain, a method capable of configuring a time resource foreach transmission occasion is required. To this end, a new field mayalso be defined in the DCI, but in this case, a size of a DCI format isdiversified, and as a result, complexity of the UE for decoding thePDCCH may increase. In order to configure/indicate a time domainresource for time domain repeated transmission while maintaining aconventional DCI format as it is, a specific rule may be defined betweenthe BS and the UE.

When mini-slot granularity repeated transmission is configured/indicatedto the UE, the time domain resource indicated through the DCI maycorrespond to the first transmission occasion and a time domain resourcefor the other transmission occasion may have the same size as theresource indicated by the DCI and may be configured in concatenationwith the relevant resource. In other words, the time domain resourceindicated based on the ‘time domain resource assignment’ field of theDCI may correspond to the first transmissions occasion. The time domainresource for the second transmission occasion may have the same size asthe time domain resource of the first transmission occasion, and may beconfigured in concatenation therewith. As an example, the firsttransmission occasion and the second transmission occasion may have thesame symbol number.

In the above description, the ‘mini-slot’ may mean a schedulingstructure having a granularity of 2, 4, 6, and 7 symbols which may beindicated by PDSCH mapping type B.

FIG. 13 illustrates an example of resource allocation for repeatedtransmission in a time domain proposed in the present disclosure. FIG.13 is just one example for convenience of the description and does notlimit the technical scope of the present disclosure.

Referring to FIG. 13, four symbols of #3 to #6 are indicated through theDCI, and this assumes that the symbols are assigned for the firsttransmission occasion. In addition, the time domain resources (i.e.,four symbols) having the same size may be concatenated and assigned forthe second transmission occasion according to the proposed method. Inthe example of FIG. 13, only up to the second transmission occasion isillustrated, but the proposed may be applied even when there is anadditional transmission occasion. For example, a third transmissionoccasion may be defined according to the rule after the secondtransmission occasion, and the proposal is applied transmissionoccasions which may be additionally defined based on the abovetransmission occasion to assign the time domain resource.

In the case of assigning the time domain resource for the repeatedtransmission as in the method of Proposal 3, since a separate DCI fieldis not required, there is an advantage in that the conventional DCIformat may be maintained. Further, since additional signaling forresource configuration is not required for each transmissions occasion,it is advantageous even in terms of the signaling overhead.

In Proposal 3, when different transmission occasions are concatenated,application of the gap symbol(s) may be considered. When differenttransmission occasions are concatenated according to a specificsubcarrier spacing (SCS) value or a UE capability related to whether theUE being capable of shifting an FFT window, whether to apply the gapsymbol(s) may be determined.

For example, when the SCS is large, different transmission occasions maybe concatenated with N symbol gaps. In other words, the resource of thesecond transmission occasion may be assigned from a symbol separatedfrom (after) the first transmission occasion by N symbol gaps. Thereason is that a case where the SCS is large may mean FR2 meaning ahigher frequency band, and in this case, an influence of inter-symbolinterference may increase due to a difference in transmission time fromdifferent TRPs, and a situation may occur in which a switching delay fortransmission and reception beams of the BS/UE should be considered.

Accordingly, the BS may configure/indicate, to the UE, whether to applythe gap symbol(s) and/or the number of gap symbols when concatenatingdifferent transmission occasions. For example, whether to apply the gapsymbol(s) and/or the number of gap symbols may be forwarded through thehigher layer signaling (e.g., RRC/MAC-CE). For example, whether to applythe gap symbol(s) or/and the number of gap symbols may beconfigured/indicated to the UE while mapping to a specific subcarrierspacing (SCS) value. The SCS may mean an SCS value configured to the UEfor downlink data reception. The mapping relationship may be fixedlydefined between the BS and the UE or configured to the UE through thehigher layer signaling.

As another example, a UE that may dynamically move according to a UEcapability for dynamically shifting the FFT window which may mean agranularity by which the UE acquires a sample value for a symbolsubjected to OFDM may concatenate different transmission occasionswithout the gap symbol, and otherwise, concatenate differenttransmission occasions with the gap symbol(s).

In the example of FIG. 13 above, two transmission occasions are assumed,but two or more multiple transmission occasions may beindicated/configured. When the method of Proposal 3 described above isapplied, there may be a case where the repeated transmission should beperformed by exceeding one slot in some cases. In order to prevent sucha case, when the repeated transmission is made by exceeding one slot, atransmission occasion which may be defined in a first slot may berepeatedly transmitted by a slot granularity.

FIG. 14 illustrates an example of slot unit repeated transmission basedon a transmission occasion structure defined in a first slot in order toprevent repeated transmission by exceeding one slot. Referring to FIG.14, four symbols of #3 to #6 are indicated through the DCI, and thisassumes that the symbols are assigned for the first transmissionoccasion. In addition, FIG. 14 shows that the time domain resources(i.e., four symbols) having the same size may be concatenated andassigned for the second transmission occasion according to the proposal.Since up to the second transmissions occasion may be transmitted in oneslot, the second transmission occasion may be configured to beconcatenated. In order to concatenate and configure the thirdtransmission occasion, four symbols are required, but a remaining symbolexceeds one slot subsequent to three (11, 12, and 13). In this case, asproposed in the present disclosure, the transmission occasion structurewhich may be defined in the first slot may be repeatedly transmitted bythe slot granularity.

In addition to Proposal 3 described above, a method for configuring thetime domain resource for the transmission occasion for the repeatedtransmission even when time domain resources for different transmissionoccasions may not be assigned to the same slot may be required.Hereinafter, a method for solving such a problem will be described indetail.

As a first method, the BS may configure/indicate mini-slot granularityrepeated transmission only in one slot so as to prevent such a problemfrom occurring. As described above, the ‘mini-slot granularity repeatedtransmission’ may mean a scheduling structure having repeatedtransmission by a granularity of 2, 4, 6, and 7 symbols which may beindicated by PDSCH mapping type B. In this case, time resources for alltransmission occasions may be assigned in one slot, and the UE may notexpect that the repeated transmission exceeding one slot is indicated.

As a second method, when the time domain resource for each transmissionoccasion is defined according to Proposal 3 above, if a transmissionoccasion exceeding a boundary of the slot is generated, the relevanttransmission occasion may be defined to be assigned with a resource ofthe same form as the previous transmission occasion in a next slot.

FIG. 15 illustrates an example of resource allocation to a transmissionoccasion exceeding a slot boundary according to a method proposed in thepresent disclosure. FIG. 15 is just for convenience of the descriptionand does not limit the technical scope of the present disclosure.

In the example of FIG. 15, it is assumed that the time domain resourceindicated through the DCI is from symbol #8 to symbol #11, and therelevant resource is assigned to the first transmission occasion. Whenthe method of Proposal 3 described above is considered, in thesubsequent transmitted second transmission occasion, resources havingthe same size should be assigned in concatenation with each other afterthe first transmission occasion, but exceed the boundary of the slot inthe example of FIG. 15. Accordingly, in this case, it may be assumedthat in respect to the time domain resource for the second transmissionoccasion, a resource at the same location as the first transmissionoccasion is assigned in the next slot. That is, the resource for thesecond transmission occasion may be assigned from symbol #8 to symbol#11 of a second slot. Further, the same rule is applied even to the caseof the third transmission occasion to assign resources of symbols #8 to#11 of a third slot.

When the resource is configured as such for the transmission occasionfor the repeated transmission, the repeated transmission exceeding theslot boundary may be supported, but there may be a disadvantage in thatthe latency increases. As a method capable of supplementing suchlatency, a third method is proposed.

As a third method, when the time domain resource for each transmissionoccasion is defined according to Proposal 3 above, if a transmissionoccasion exceeding a boundary of the slot is generated, the relevanttransmission occasion may be configured/defined to be transmitted from aspecific symbol location of the next slot. For example, the specificsymbol location may follow a front-load DMRS location for PDSCH mappingtype A configured to the UE. The front-load DMRS location for PDSCHmapping type A may be configured to the UE through a higher layerparameter ‘dmrs-TypeA-Position’.

FIG. 16 illustrates an example of a time domain resource allocationmethod when a transmission occasion exceeding a slot boundary occurs towhich the method proposed in the present disclosure may be applied. FIG.16 is just one example for convenience of the description and does notlimit the technical scope of the present disclosure.

Referring to FIG. 16, it is assumed that the time domain resourceindicated through the DCI is from symbol #8 to symbol #11, and therelevant resource is assigned to the first transmission occasion. Whenthe method of Proposal 3 described above is considered, in thesubsequent transmitted second transmission occasion, resources havingthe same size should be assigned in concatenation with each other afterthe first transmission occasion, but exceed the boundary of the slot inthe example of FIG. 16. Accordingly, in this case, it may be assumedthat in respect to the time domain resource for the second transmissionoccasion, the resource is assigned from the front-load DMRS location forPDSCH mapping type A configured to the UE in the next slot. In FIG. 15,a case where ‘dmrs-TypeA-Position’ is configured to 2 is assumed.

In the example of FIG. 16, the third transmission occasion may bedefined in the same slot according to Proposal 3 after the secondtransmission occasion, and resources having the same size may beassigned in concatenation with each other. In the proposal, there may bean advantage in that the latency may be reduced by removing anunnecessary delay.

In the proposal, it is proposed that ‘specific symbol location’ may morecharacteristically follow ‘front-load DMRS location for PDSCH mappingtype A configured to UE, and when it is considered that PDCCHtransmission from the BS may be achieved in a symbol duration earlierthan the front-load DMRS location for PDSCH mapping type A configured tothe UE, there may be an advantage in that a collision between the PDCCHand PDSCH which is repeatedly transmitted may be avoided through theproposed method.

As a fourth method, when the BS intends to perform the mini-slotgranularity repeated transmission, the BS may configure/indicate a timeresource assignment candidate for performing the mini-slot granularityrepeated transmission. The BS may configure/indicate, to the UE, aspecific time resource assignment scheme among the time resourceassignment candidates while configuring/indicating the mini-slotgranularity repeated transmission to the UE. The ‘mini-slot’ may mean ascheduling structure having a granularity of 2, 4, 6, and 7 symbolswhich may be indicated by PDSCH mapping type B.

The time resource assignment may be indicated to the UE through the‘time domain resource assignment’ field in the DCI. According to thecurrent standard, one time domain resource in one slot may be indicatedthrough the field value. A method for enhancing a function of the ‘timedomain resource assignment’ field in order to perform the mini-slotgranularity repeated transmission may be considered as follows.

For example, in a case where the UE is configured/indicated with themini-slot granularity repeated transmission and a case where the UE isnot configured/indicated with the mini-slot granularity repeatedtransmission, an interpretation method of the field may be different.

Specifically, when the BS intends to perform the mini-slot granularityrepeated transmission, the BS may configure/indicate a time resourceassignment candidate corresponding to the field. For convenience ofdescription, the candidate is referred to as a first candidate.Alternatively, when the relevant operation is not the mini-slotgranularity repeated transmission, the BS may configure/indicate thetime resource assignment candidate corresponding to the field. Forconvenience of description, the candidate is referred to as a secondcandidate.

When the UE is configured/indicated with the mini-slot granularityrepeated transmission, the UE may expect that one of value of the firstcandidates will be indicated through the ‘time domain resourceassignment’ field. On the contrary, when the operation is not themini-slot granularity repeated transmission, the UE may expect that onevalue of the second candidates will be indicated. Additionally, timeresource assignment candidates included in the first candidate mayinclude time domain resource information for multiple transmissionoccasions. Further, the respective candidates may correspond todifferent transmission occasion numbers and a specific value isindicated to indicate a specific transmission occasion number.

In the proposed method, the BS may apply the method and/or embodiment ofProposal 1 described above in order to configure/indicate the mini-slotgranularity repeated transmission to the UE. For example, the mini-slotgranularity repeated transmission among multiple repeated transmissionmethods may be configured through the higher layer signaling, andwhether the mini-slot granularity repeated transmission is actuallyperformed may be indicated through the DCI. Accordingly, when it isindicated that the mini-slot granularity repeated transmission isactually performed through the DCI, one value of the first candidatesmay be indicated for the time resource assignment according to theproposed scheme, and when the mini-slot granularity repeatedtransmission is not indicated, one value of the second candidates may beindicated for the time resource assignment.

The example of the signaling may become one example for applying theproposed scheme, and it is apparent that other examples to which theproposed scheme is applied may also be included in the proposal, and amethod to which a relevant proposed matter may be applied is not limitedto the example.

Table 29 shows an example of first candidates which may be indicatedthrough the ‘time domain resource assignment’ field when the mini-slotgranularity repeated transmission is performed. Table 29 is just anexample for helping to appreciate the present disclosure and does notlimit the technical scope of the present disclosure.

TABLE 29 PDSCH Row mapping index type K0 S1 L1 S2 L2 S3 L3 S4 L4 1 TypeB 0 5 2 7 2 2 Type B 0 5 2 7 2 9 2 11 2 3 Type B 0 9 2 11 2 4 Type B 0 44 8 4 5 Type B 0 6 4 10 4 6 Type B 0 0 7 7 7 7 Type B 0 5 2 7 4 11 2 8Type B 0 4 2 6 2 8 4 12 2 9 Type B 0 5 2 8 2 10 Type B 0 4 4 9 4 11 TypeB 0 4 4 10 4

In Table 29, K0, Sx (x=1, 2, 3, 4), and Lx (x=1, 2, 3, 4) may mean aslot granularity distance from a slot receiving the DCI to a slot inwhich the PDSCH is actually scheduled, a start symbol location of ascheduling resource based on a start time point of the slot for an x-thtransmission occasion, and the number of symbols continuously scheduledfrom Sx for the x-th transmission occasion, respectively.

The proposed scheme like the example of Table 29 has the followingfeature.

First, the number of different transmission occasions may be indicated.Referring to Table 29, row index 1/3/4/5 indicates a transmissionoccasion number corresponding to 2, row index 7 indicates a transmissionoccasion number corresponding to 3, and row index 2/8 indicates atransmission occasion number corresponding to 4.

Second, mini-slots having different symbol lengths may be assigned todifferent transmission occasions. Referring to Table 29, row index 7/8may be indicated for a transmission occasion in which a mini-slot havinga symbol length of 2 and a mini-slot having a symbol length of 4 aredifferent.

Third, whether there is the gap symbol between different transmissionoccasions or/and a length of the gap symbol may be indicated. Referringto Table 29, when resource assignments of row indexes 1 and 9 arecompared, the resource assignments are the same in that two transmissionoccasions are indicated, and the start symbol of the first transmissionoccasion is the same and two symbols are assigned to each transmissionoccasion, but different in that whether there is the gap symbol betweenthe first transmission occasion and the second transmission occasion.That is, in row index 1, there is no gap symbol and in row index 9,there is the gap symbol. It may be confirmed that there is a differencefor whether there is one gap symbol between different transmissionoccasions even in row indexes #4 and #10. Meanwhile, when row indexes 10and 11 are compared, it may be confirmed that the length of the gapsymbol may be indicated. It may be confirmed that in the case of rowindex 10, there is one gap symbol between different transmissionoccasions, while in the case of row index 11, there are two gap symbols.

In the proposal, the ‘time domain resource assignment’ field is assumedas the DCI field for indicating one value of the time resourceassignment candidates, but it is apparent that a method for applying theproposal by using another field in the DCI is also possible. Forexample, a new DCI field may be introduced in order to perform theproposed scheme or the proposed method may be applied by differinginterpretation of a specific field among the fields in the DCI definedin the current standard. For example, the proposed method may be appliedby differing the antenna port(s) field defined in TS 38.212 or/and theMCS/RV/NDI field corresponding to each of TB 1/2.

Further, as in the method and/or embodiments of Proposal 3 describedabove, when the repeated transmission is performed in the time domain, aDMRS pattern for transmission occasions which are repeatedly transmittedmay be determined as follows. A DMRS pattern for the first transmissionoccasion may be indicated through the DCI, and a DMRS pattern for theother transmission occasion may adopt a pattern which is the same as theDMRS pattern for the first transmission occasion indicated through theDCI.

FIG. 17 illustrates an example of application of a DMRS pattern torepeatedly transmitted transmission occasions.

<Proposal 4>

A TCI state field (i.e., a transmission configuration indication field)in the current DCI may indicate up to two TCI states through a specificcodepoint. In this case, the eMBB operation is assumed. In other words,the specific codepoint configured through the TCI field in the DCI maycorrespond to multiple (e.g., two) TCI states, and the eMBB operation isdefined in such a manner that up to two TCI states may be indicated bythe specific codepoint. In this case, when the URLLC operation isconsidered, improvement for some operations may be considered. Thereason is that it may be preferable to indicate more TCI states in thecase of the URLLC operation.

For example, it may be considered that a diversity gain is increased byincreasing the repeated transmission number in the URLLC operation andthe reception SNR is enhanced. Accordingly, multiple TCI states need tobe considered, and a limitation for up to two TCI states defined byassuming eMBB may be alleviated. In this case, codepoints mapped to theTCI state field for the eMBB operation and codepoints mapped to the TCIstate field for the URLLC operation may be differently/separatelyconfigured.

For example, the codepoints mapped to the TCI state field for the eMBBoperation may indicate up to two TCI states, while the codepoints mappedto the TCI state field for the URLLC operation may be configured toindicate up to four TCI states. In the example, the number of up to fourTCI states is just an example for convenience of description, and doesnot limit the technical scope of the present disclosure, and four ormore TCI states may also be indicated.

To this end, the BS may configure/indicate whether the relevantoperation is the eMBB operation or the URLLC operation, and it may bedetermined which codepoints configuration the UE is to follow based onthe configured operation. In the proposal, as the method forconfiguring/indicating the eMBB operation or the URLLC operation to theUE, the method of Proposal 1 described above may be applied. Forexample, a specific repeated transmission method (scheme) among multiplerepeated transmission methods may be configured through the higher layersignaling, and whether the URLLC operation (repeated transmission) is tobe performed or the eMBB operation is to be performed actually may beindicated through the DCI. Alternatively, one of the eMBB and URLLCoperations may be configured directly through a specific higher layerparameter.

Alternatively, a specific operation of the eMBB operation and the URLLCoperation may be indicated according to an RNTI value to succeed indecoding the PDCCH by mapping a specific RNTI value and a specificoperation. For example, when CRC masking of the DCI received by the UEis performed by using the RNTI configured as a usage of the MTRP-URLLC,the UE may recognize that the URLLC operation is configured and when theCRC masking of the DCI is performed by using the RNTI configured as ausage of the MTRP-eMBB, the UE may recognize that the eMBB operation isconfigured.

The example of the signaling may become one example for applying theproposed scheme, and it is apparent that other examples to which theproposed scheme is applied may also be included in the proposal, and amethod to which a relevant proposed matter may be applied is not limitedto the example.

The TCI state corresponding to each codepoint of the TCI field may bepre-defined, and defined differently for each of the URLLC operation andthe eMBB operation. For example, the BS configures the TCI field valueto the UE separately for Tables 30 and 31, and uses Table 30 in the caseof the eMBB operation and Table 31 in the case of the URLLC operation.In the example, the mapping relationship between the codepoint of theDCI and the TCI state is represented by the table, but a mapping rule ofanother form may also be configured.

The TCI field value may be configured by using the MAC CE in a pool ofup to 64 TCI states which are RRC-configured, and MAC CE for configuringthe TCI field value for eMBB and MAC CE for configuring the URLLC TCIfield value may be defined and signaled divisively/separately.Furthermore, the TCI states pools for the eMBB and the URLLC may also beconfigured separately.

TABLE 30 TCI field TCI codepoint state 000 0 001 1 010 2 011 0, 1 100 0,2 101 1, 2 110 3 111 4

TABLE 31 TCI field TCI codepoint state 000 0, 1 001 2, 5 010 4, 5, 6, 7011 8, 9, 10, 11 100 0, 1, 2, 3 101 0, 2, 4, 6 110 1, 3, 5, 7 111 10, 20

FIG. 18 illustrates signaling when a UE receives single DCI (i.e., whena representative TRP transmits a DCI to the UE) in a situation of M-TRP(or M-cell, all the TRPs may be hereinafter replaced by cells, orassumed as M-TRP even when a plurality of CORESETs (/CORESET groups) isconfigured from one TRP). FIG. 18 illustrates merely an example forconvenience of explanation and does not limit the technical scope of thepresent disclosure.

Although the following description will be given with respect to “TRP”,“TRP” may be replaced with other expressions such as a panel, an antennaarray, a cell (e.g., macro cell/small cell/pico cell), a TP(transmission point), and a base station (gNB). Also, as describedabove, the TRPs may be divided according to information (e.g., index,ID) on a CORESET group (or CORESET pool). For example, if one UE isconfigured to perform transmission and reception to and from multipleTRPs (or cells), this may mean that multiple CORESET groups (or CORESETpools) are configured for one UE. Such a configuration for CORESETgroups (or CORESET pools) may be performed via higher layer signaling(e.g., RRC signaling).

Referring to FIG. 18, signaling between two TRPs and the UE isconsidered for the convenience of explanation, but this signaling methodcan be extendedly applied to signaling between multiple TRPs andmultiple UEs. In the description below, a network side may be a basestation including a plurality of TRPs or a cell including a plurality ofTRPs. For example, ideal/non-ideal backhaul may be configured betweenTRP 1 and TRP 2 constituting the network side. Further, the descriptionbelow is described based on multiple TRPs, but this can be extendedlyapplied to transmission through multiple panels. In addition, in thepresent disclosure, an operation for a UE to receive a signal fromTRP1/TRP2 may be interpreted/described as (or may be) an operation forthe UE to receive a signal from the network side (through/usingTRP1/TRP2), and an operation for the UE to transmit a signal toTRP1/TRP2 may be interpreted/described as (or may be) an operation forthe UE to transmit a signal to the network side (through/usingTRP1/TRP2), and they may be interpreted/described in an inversed manner.

The UE may receive configuration information related to multipleTRP-based transmission and reception through/using TRP 1 (and/or TRP 2)from a network side (S1805). That is, the network side may transmitconfiguration information related to multiple TRP transmission andreception to the UE through/using TRP 1 (and/or TRP 2) (S1805). Theconfiguration information may include information related to theconfiguration of the network side (i.e., TRP configuration), resourceinformation related to multiple TRP-based transmission and reception(resource allocation), and so on. The configuration information may bedelivered through higher-layer signaling (e.g., RRC signaling, MAC-CE,etc.). Also, if the configuration information is predefined or preset,the corresponding step may be omitted.

For example, the configuration information may include CORESET relatedconfiguration information (e.g., ControlResourceSet IE) as described inthe above-described methods (e.g., proposal 1/proposal 2/proposal3/proposal 4, etc.). The CORESET related configuration information mayinclude a CORESET related ID (e.g., controlResourceSetID), an index of aCORESET pool for CORESET (e.g., CORESETPoolIndex), time/frequencyresource configuration of CORESET, TCI information related to CORESET,and the like. The index of the CORESET pool (e.g., CORESETPoolIndex) maymean a specific index (e.g., CORESET group Index, HARQ Codebook index)mapped/configured to each CORESET.

For example, the configuration information may also includeconfigurations related to PDCCH/PDSCH/PUCCH/PUSCH, etc., as described inthe methods (e.g., Proposal 1/Proposal 2/Proposal 3/Proposal 4, etc.).

For example, the configuration information may include informationrepresenting which operation is to be performed among multiple URLLCoperations according to the method and/or embodiment (e.g., Proposal1/Proposal 2/Proposal 3/Proposal 4, etc.). As an example, theconfiguration information may include information for configuring one ofthe URLLC schemes (e.g., scheme 2a/2b/3/4).

For example, the configuration information may include configurationinformation for a TCI state configuration related to the operation ofthe method and/or embodiment (e.g., Proposal 1/Proposal 2/Proposal3/Proposal 4, etc.)/configuration information related to specificrepeated transmission related to the URLLC/information on a value(s) forthe repeated transmission number of the transmission occasion and/or acandidate value(s)/the number of shifting symbols between differenttransmission occasions/information related to RV values, etc.

For example, the operation of the UE (reference numeral 100/200 in FIGS.21 to 25) which receives the multiple TRP based transmission andreception related configuration information from the network side(reference numeral 100/200 in FIGS. 21 to 25) in step S1805 describedabove may be implemented by devices in FIGS. 21 to 25 to be describedbelow. For example, referring to FIG. 22, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 soas to receive the multiple TRP based transmission and reception relatedconfiguration information, and one or more transceivers 106 may receiveconfiguration information and one or more transceivers 106 may receivethe multiple TRP based transmission and reception related configurationinformation from the network side.

Likewise, the operation of the network side (reference numeral 100/200in FIGS. 21 to 25) which transmits the multiple TRP based transmissionand reception related configuration information to the UE (referencenumeral 100/200 in FIGS. 21 to 25) in step S1805 described above may beimplemented by the devices in FIGS. 21 to 25 to be described below. Forexample, referring to FIG. 22, one or more processors 102 may controlone or more transceivers 106 and/or one or more memories 104 so as totransmit the multiple TRP based transmission and reception relatedconfiguration information, and one or more transceivers 106 may receiveconfiguration information and one or more transceivers 106 may transmitthe multiple TRP based transmission and reception related configurationinformation from the network side.

The UE may receive, from the network side, DCI and Data 1 scheduled bycorresponding DCI through/using TRP 1 (S1810-1). Further, the UE mayreceive Data 2 from the network side through/using TRP 2 (S1810-2). Thatis, the network side may transmit, to the UE, DCI 1 and Data 1 scheduledby corresponding DCI through/using TRP 1 (S1810-1). Further, the networkside may transmit Data 2 to the UE through/using TRP 2 (S1810-2). Forexample, DCI and Data (e.g., Data 1, Data 2) may be transferred througha control channel (e.g., PDCCH, etc.) and a data channel (e.g., PDSCH,etc.), respectively. Further, steps S1810-1 and S1810-2 may besimultaneously performed or any one may be performed earlier than theother one.

For example, the DCI may include a TCI field, an antenna port(s) field,a time domain resource assignment field, an MCS field, and an RV field.

For example, the DCI may include information representing whether theURLLC operation configured to the UE through the higher layer signalingis performed which operation is to be performed as described in themethod and/or embodiment (e.g., Proposal 1/Proposal 2/Proposal3/Proposal 4, etc.). In this case, a specific bit of a DMRS portindication field in the DCI may be used. For example, the DCI mayinclude information representing a total repeated transmission number.In this case, the relevant repeated transmission number may bedetermined according to the number of TCI states indicated through theDCI. For example, the DCI may also include the number of shiftingsymbols between different transmission occasions/information related toRV values (e.g., the actual RV difference value/the difference value inthe order/the actual RV value/the RV combination related indicationinformation). For example, the DCI may include information representinga time domain resource of repeatedly transmitted data. As an example,the DCI may include information indicating the mini-slot granularityrepeated transmission/information representing whether the mini-slotgranularity repeated transmission is performed. For example, theinterpretation of the TCI state field in the DCI may be determinedaccording to whether the eMBB operation being configured or the URLLCoperation being configured.

For example, the DCI may be configured to be used for scheduling forboth Data 1 and Data 2, and may indicate that Data 1 and Data 2 are thesame data having the same systematic bits, as described in the methodand/or embodiment (e.g., Proposal 1/Proposal 2/Proposal 3/Proposal 4,etc.). In other words, Data 1 and Data 2 may correspond to the same TB.

For example, the operation of the UE (reference numeral 100/200 in FIGS.21 to 25) which receives the DCI and/or Data 1 and/or Data 2 from thenetwork side (reference numeral 100/200 in FIGS. 21 to 25) in stepS1810-1/S1810-2 described above may be implemented by the devices inFIGS. 21 to 25 to be described below. For example, referring to FIG. 22,one or more processor 102 may control one or more transceivers 106and/or one or more memories 104 to receive the DCI and/or Data 1 and/orData 2, and one or more transceivers 106 may receive, from the networkside, the DCI and/or Data 1 and/or Data 2.

Likewise, the operation of the network side (reference numeral 100/200in FIGS. 21 to 25) which transmits the DCI and/or Data 1 and/or Data 2to the UE (reference numeral 100/200 in FIGS. 21 to 25) in stepS1810-1/S1810-2 described above may be implemented by the devices inFIGS. 21 to 25 to be described below. For example, referring to FIG. 22,one or more processor 102 may control one or more transceivers 106and/or one or more memories 104 to transmit the DCI and/or Data 1 and/orData 2, and one or more transceivers 106 may transmit, to the UE, theDCI and/or Data 1 and/or Data 2.

The UE may decode Data 1 and Data 2 received from TRP 1 and TRP 2(S1815). For example, the UE may perform channel estimation and/ordecoding for data based on the method (e.g., Proposal 1/Proposal2/Proposal 3/Proposal 4, etc.).

For example, the UE may know that the BS transmits the same dataaccording to a specific URLLC operation, and decode Data 1 and Data 2 byassuming that Data 1 and Data 2 are the same data and systematic bitsare the same data, as described in the proposed method and/or embodiment(e.g., Proposal 1/Proposal 2/Proposal 3/Proposal 4, etc.). For example,the UE may decode Data 1 and Data 2 by considering a repeatedtransmission number indicated by the BS through the higher layersignaling/DCI. As an example, the UE may decode Data 1 and Data 2 byassuming that the BS repeatedly transmits the same data as large as thenumber of TCI states indicated through the DCI. For example, the UE maydecode Data 1 and Data 2 (repeatedly transmitted in one slot) based onthe number of shifting symbols between different transmissionoccasions/the information related to RV values (e.g., the actual RVdifference value/the difference value in the order/the actual RVvalue/the RV combination related indication information). For example,the UE may decode Data 1 and Data 2 by assuming that the BS repeatedlytransmits the same data in a time domain indicated through the DCI. Forexample, the UE may decode Data 1 and Data 2 by using the TCI statevalue which the BS indicates through the DCI.

For example, the operation of the UE (reference numeral 100/200 of FIGS.21 to 25) which decodes Data 1 and Data 2 in step S1815 described abovemay be implemented by the devices of FIGS. 21 to 25 to be describedbelow. For example, referring to FIG. 22, one or more processor 102 maycontrol one or more memories 104 to perform the operation of decodingData 1 and Data 2.

The UE may transmit HARQ-ACK information (e.g., ACK information, NACKinformation, etc.) for the DCI and/or Data 1 and/or Data 2 above to thenetwork side through/using TRP 1 and/or TRP 2 through one or morePUCCH(s) based on the proposed method (e.g., Proposal 1/Proposal2/Proposal 3/Proposal 4, etc.) (S1820-1 and S1820-2). That is, thenetwork side may receive, from the UE, HARQ-ACK information (e.g., ACKinformation, NACK information, etc.) for the DCI and/or Data 1 and/orData 2 above through/using TRP 1 and/or TRP 2 through one or morePUCCH(s) based on the proposed method (e.g., Proposal 1/Proposal2/Proposal 3/Proposal 4, etc.) (S1820-1 and S1820-2).

For example, the HARQ-ACK information for Data 1 and/or Data 2 may becombined into one or separated. Further, the UE may be configured totransmit only HARQ-ACK information to representative TRP (e.g., TRP 1),and transmission of the HARQ-ACK information to the other TRP (e.g., TRP2) may also be omitted. For example, the HARQ-ACK information may betransmitted through the PUCCH and/or the PUSCH.

For example, the operation of the UE (reference numeral 100/200 in FIGS.21 to 21) which transmits the HARQ-ACK information for Data 1 and/orData 2 to the network side (reference numeral 100/200 in FIGS. 21 to 25)through one or more PUCCHs in step S1820-1/S1820-2 described above maybe implemented by the devices in FIGS. 21 to 25 to be described below.For example, referring to FIG. 22, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 totransmit the HARQ-ACK information for Data 1 and/or Data 2 through oneor more PUCCHs, and one or more transceivers 106 may transmit, to thenetwork side, the HARQ-ACK information for Data 1 and/or Data 2.

Likewise, the operation of the network side (reference numeral 100/200in FIGS. 21 to 25) which receives the HARQ-ACK information for Data 1and/or Data 2 from the UE (reference numeral 100/200 in FIGS. 21 to 25)through one or more PUCCHs in step S1820-1/S1820-2 described above maybe implemented by the devices in FIGS. 21 to 25 to be described below.For example, referring to FIG. 22, one or more processors 102 maycontrol one or more transceivers 106 and/or one or more memories 104 toreceive the HARQ-ACK information for Data 1 and/or Data 2, and one ormore transceivers 106 may receive, from the UE, the HARQ-ACK informationfor Data 1 and/or Data 2.

In FIG. 18 described above, the methods are described based on a singleDCI based M-TRP operation is primarily described, but in some cases, themethods may be applied even to a multi-DCI based M-TRP operation.

FIG. 19 illustrates an example of an operation flowchart of downlinkdata reception of a UE to which methods (e.g., Proposal 1/Proposal2/Proposal 3/Proposal 4, etc.) proposed in the present disclosure may beapplied. The UE may be supported by a plurality of TRPs, andideal/non-ideal backhaul may be configured among the plurality of TRPs.FIG. 19 is just for convenience of the description and does not limitthe scope of the present disclosure. Further, some step(s) illustratedin FIG. 19 may be omitted according to a situation and/or aconfiguration.

In the following description, the network side is described based on“TRP”, but as described above, “TRP” may be replaced with expressionsincluding a panel, an antenna array, a cell (e.g., macro cell/smallcell/pico cell), a transmission point (TP), a base station (gNB, etc.),etc., and applied. Further, as described above, the TRP may bedistinguished according to information (e.g., an index or ID) on aCORESET group (or CORESET pool). As an example, when one UE isconfigured to perform transmission/reception with multiple TRPs (orcells), this may mean that multiple CORESET groups (or CORESET pools)are configured for one UE. The configuration for the CORESET group (orCORESET pool) may be performed through the higher layer signaling (e.g.,RRC signaling).

The UE may receive configuration information (S1910). The configurationinformation may be received through a higher layer signaling (e.g., RRCor MAC-CE). The configuration information may include informationrelated to a method and/or embodiments described in the methods (e.g.,Proposal 1/Proposal 2/Proposal 3/Proposal 4, etc.).

For example, the configuration information may include CORESET relatedconfiguration information (e.g., ControlResourceSet IE). The CORESETrelated configuration information may include ID (e.g.,controlResourceSetID) related to the CORESET, an index (e.g.,CORESETPoolIndex) of a CORESET pool for the CORESET, a time/frequencyresource configuration of the CORESET, TCI information related to theCORESET, etc.

For example, the configuration information may include a downlinkchannel related configuration (e.g., PDCCH-Config, PDSCH-Config). Thedownlink channel related configuration may include DMRS maxLength, aconfiguration type, a mapping type, etc.

For example, the configuration information may include information on atransmission scheme of downlink data. Based on the information on thedownlink data transmission scheme, an eMBB operation or a URLLCoperation may be configured or one of multiple schemes (e.g., an SDMscheme, a TDM scheme, or an FDM scheme) related to the URLLC operationmay be indicted/configured. As an example, the configuration informationmay include a higher layer parameter (e.g., RepSchemeEnabler) forindicating one of the schemes for the URLLC operation, and whether therelevant scheme is an FDM based scheme (e.g., scheme 2a/2b) or a TDMbased scheme (scheme 3/4) may be configured by using the higher layerparameter. As a specific example, a repetition scheme based on timedivision multiplexing (TDM) may be configured based on the configurationinformation.

For example, the configuration information may include informationrelated to the number of transmission occasions. As an example, theconfiguration information may include a parameter (e.g.,repetitionnumber) for configuring a repeated transmission number of thetransmission occasions, and a specific repetition number (e.g., 2, 3, 4,5, 6, 7, 8, or 16) may be indicated by the parameter. As anotherexample, candidate values of the number of plurality of transmissionoccasions may be indicated based on the configuration information.

For example, the configuration information may include information onthe number of shifting symbols between transmission occasions. Theshifting symbol may be replaced with an expression such as a gap symbolor a symbol offset. As an example, the shifting symbol may mean a gapbetween a last symbol of a first transmission occasion and a firstsymbol of a second transmission occasion.

For example, an operation of the UE (reference numeral 100/200 in FIGS.21 to 25) which receives the configuration information in step S1930described above may be implemented by the devices in FIGS. 21 to 25 tobe described below. For example, referring to FIG. 22, one or moreprocessors 102 may control one or more transceivers 106 and/or one ormore memories 104 so as to transmit the configuration information andone or more transceivers 106 may receive the configuration information.

The UE may receive downlink control information (DCI) (S1920). The DCImay be transmitted through a downlink control channel (e.g., PDCCH).

As described in the method (e.g., Proposal 1/Proposal 2/Proposal3/Proposal 4, etc.), the DCI may include at least one of a DMRS portrelated field (e.g., antenna port(s) field), a transport block relatedfield (e.g., MCS/New data indicator/RV field), a transmissionconfiguration indication (TCI) field, a time domain resource assignmentfield, or a redundancy version (RV) field.

For example, a plurality of TCI states may be indicated based on the TCIfield included in the DCI. When the plurality of TCI states isindicated, the UE may know that the relevant operation is an M-TRPoperation. As an example, two or more TCI states may be indicated inrelation to a URLLC M-TRP operation.

For example, resource assignment in a time domain for a firsttransmission occasion may be determined based on the time domainresource assignment field included in the DCI. Further, the resourceassignment in the time domain for a second transmission occasion may bedetermined based on the resource assignment in the time domain for thefirst transmission occasion. Through this, even though resourceassignment information in the time domain for the second transmissionoccasion is not included in the DCI, the resource assignment in the timedomain for the second transmission occasion may be determined. Throughthis, signaling overhead may be reduced and compatibility with aconventional DCI format may also be secured.

As a specific example, a size of a second resource in the time domainfor the second transmission occasion may be determined based on a sizeof a first resource in the time domain for the first transmissionoccasion. Further, the size of the first resource and the size of thesecond resource may be equal to each other. That is, the size of thesecond resource may be determined as a size which is the same as thesize of the first resource. As an example, the number of symbols for thefirst transmission occasion may be equal to the number of symbols of thesecond transmission occasion.

For example, the first resource and the second resource may beconstituted as a unit of 2, 4, or 7 OFDM symbols. The first resource andthe second resource may be positioned in concatenation with each otherin the time domain. Alternatively, a first symbol of the second resourcemay be positioned from a last symbol of the first resource after aspecific number of symbols. In this case, in the UE operation of FIG.19, the method may further include receiving information on the specificnumber of symbols. As an example, the information on the specific numberof symbols may also be received while being included in theconfiguration information.

For example, an operation of the UE (reference numeral 100/200 in FIGS.21 to 25) which receives the DCI in step S1940 described above may beimplemented by the devices in FIGS. 21 to 25 to be described below. Forexample, referring to FIG. 22, one or more processors 102 may controlone or more transceivers 106 and/or one or more memories 104 so as toreceive the DCI and one or more transceivers 106 may receive the DCI.

The UE may receive a plurality of transmission occasions (S1950). Theplurality of transmission occasions may be received based on the DCI.For example, an operation of receiving the transmission occasion may beinterpreted/appreciated as an operation of receiving downlink data or anoperation of receiving a downlink channel.

For example, the plurality of transmission occasions may be the samePDSCH transmission occasion being repeatedly transmitted/received, asdescribed in the method (e.g., Proposal 1/Proposal 2/Proposal 3/Proposal4, etc.). In other words, the plurality of transmission occasions maycorrespond to the same transport block.

For example, the number of plurality of transmission occasions may bedetermined based on the number of TCI states indicated through the TCIfield of the DCI. As described above, since the plurality oftransmission occasions may be constituted by repeatedly transmitting thetransmission occasion corresponding to the same transport block, thenumber of plurality of transmission occasions may mean the number oftimes at which the transmission occasion is repeatedly transmitted. Asan example, when the plurality of TCI states is indicated through theTCI field of the DCI (e.g., 2 TCI states), the number oftransmitted/received transmission occasions may also be equal to thenumber of plurality of TCI states (e.g., 2 transmission occasions).

As a specific example, when a first TCI state and a second TCI state areindicated through the TCI field of the DCI, the UE may receive two,i.e., a first transmission occasion and a second transmission occasion.In this case, the first TCI state may correspond to the firsttransmission occasion and the second TCI state may correspond to thesecond transmission occasion. Further, the RV value of the firsttransmission occasion and the RV value of the second transmissionoccasion may be configured differently based on the RV field of the DCI.

As another example, the number of plurality of transmission occasionsmay also be determined based on the configuration information and theDCI. As an example, candidate values of the number of plurality oftransmission occasions may be indicated based on the configurationinformation, and one value of the candidate values may beindicated/configured based on the DCI.

For example, the plurality of transmission occasions (e.g., the firsttransmission occasion and the second transmission occasion) may bereceived in a time domain resource based on time division multiplexing(TDM). That is, the plurality of transmission occasions may berepeatedly received/transmitted in a time domain resource which is notoverlapped based on the TDM.

For example, each transmission occasion may be constituted by 2, 4, or 7OFDM symbols. This may correspond to the min-slot structure of PDSCHmapping type B described in the proposed method (e.g., Proposal1/Proposal 2/Proposal 3/Proposal 4, etc.) described above. The pluralityof transmission occasions (e.g., the first transmission occasion and thesecond transmission occasion) may be TDMed and received in one slot.Alternatively, each transmission occasion may be TDMed and received as aunit of slot.

For example, the plurality of transmission occasions may be received inthe resource of the time domain determined based on the DCI. As anexample, the first transmission occasion may be receive din a first timedomain resource and the second transmission occasion may be received ina second time domain resource. The first time domain resource and thesecond time domain resource may be positioned in concatenation with eachother. Alternatively, the second time domain resource may also bepositioned apart from the first time domain resource by a specificnumber of symbols. The specific number of symbols may be replaced withthe gap symbol/the shifting symbol/the symbol offset, and expressed. Thespecific number of symbols may be received through the higher layersignaling.

For example, the number of transmission layers may also be limited to aspecific layer number (e.g., 2 layers) or less for each transmissionoccasion.

For example, an operation of the UE (reference numeral 100/200 in FIGS.21 to 25) which receives the plurality of transmission occasions in stepS1930 described above may be implemented by the devices in FIGS. 21 to25 to be described below. For example, referring to FIG. 22, one or moreprocessors 102 may control one or more transceivers 106 and/or one ormore memories 104 so as to receive the plurality of transmissionoccasions, and one or more transceivers 106 may receive the plurality oftransmission occasions.

FIG. 20 illustrates an example of an operation flowchart of a basestation (BS) performing data transmission and reception to which themethods (e.g., Proposal 1/Proposal 2/Proposal 3/Proposal 4, etc.) may beapplied. FIG. 20 is just for convenience of the description and does notlimit the scope of the present disclosure. Further, some step(s)illustrated in FIG. 20 may be omitted according to a situation and/or aconfiguration.

The BS may be a mean collecting naming an object performing transmissionand reception of data with the UE. For example, the base station may bea concept including one or more transmission points (TPs), one or moretransmission and reception points (TRPs), and the like. Further, the TPand/or the TRP may include a panel, transmission and reception units,and the like of the BS. Further, as described above, the TRP may bedistinguished according to information (e.g., an index or ID) on aCORESET group (or CORESET pool). As an example, when one UE isconfigured to perform transmission/reception with multiple TRPs (orcells), this may mean that multiple CORESET groups (or CORESET pools)are configured for one UE. The configuration for the CORESET group (orCORESET pool) may be performed through the higher layer signaling (e.g.,RRC signaling).

The BS may transmit, to the UE, configuration information (S2010). Theconfiguration information may be transmitted through a higher layersignaling (e.g., RRC or MAC-CE). The configuration information mayinclude information related to a method and/or embodiments described inthe methods (e.g., Proposal 1/Proposal 2/Proposal 3/Proposal 4, etc.).

For example, the configuration information may include CORESET relatedconfiguration information (e.g., ControlResourceSet IE). The CORESETrelated configuration information may include ID (e.g.,controlResourceSetID) related to the CORESET, an index (e.g.,CORESETPoolIndex) of a CORESET pool for the CORESET, a time/frequencyresource configuration of the CORESET, TCI information related to theCORESET, etc.

For example, the configuration information may include a downlinkchannel related configuration (e.g., PDCCH-Config, PDSCH-Config). Thedownlink channel related configuration may include DMRS maxLength, aconfiguration type, a mapping type, etc.

For example, the configuration information may include information on atransmission scheme of downlink data. Based on the information on thedownlink data transmission scheme, an eMBB operation or a URLLCoperation may be configured or one of multiple schemes (e.g., an SDMscheme, a TDM scheme, or an FDM scheme) related to the URLLC operationmay be indicted/configured. As an example, the configuration informationmay include a higher layer parameter (e.g., RepSchemeEnabler) forindicating one of the schemes for the URLLC operation, and whether therelevant scheme is an FDM based scheme (e.g., scheme 2a/2b) or a TDMbased scheme (scheme 3/4) may be configured by using the higher layerparameter. As a specific example, a repetition scheme based on timedivision multiplexing (TDM) may be configured based on the configurationinformation.

For example, the configuration information may include informationrelated to the number of transmission occasions. As an example, theconfiguration information may include a parameter (e.g.,repetitionnumber) for configuring a repeated transmission number of thetransmission occasions, and a specific repetition number (e.g., 2, 3, 4,5, 6, 7, 8, or 16) may be indicated by the parameter. As anotherexample, candidate values of the number of plurality of transmissionoccasions may be indicated based on the configuration information.

For example, the configuration information may include information onthe number of shifting symbols between transmission occasions. Theshifting symbol may be replaced with an expression such as a gap symbolor a symbol offset. As an example, the shifting symbol may mean a gapbetween a last symbol of a first transmission occasion and a firstsymbol of a second transmission occasion.

For example, an operation of the BS (reference numeral 100 and/or 200 inFIGS. 21 to 25) which transmits the configuration information in stepS2010 described above may be implemented by the devices in FIGS. 21 to25 to be described below. For example, referring to FIG. 22, one or moreprocessors 102 may control one or more transceivers 106 and/or one ormore memories 104 so as to transmit the configuration information andone or more transceivers 106 may transmit the configuration information.

The BS may transmit, to the UE, downlink control information (DCI)(S2040). The DCI may be transmitted through a downlink control channel(e.g., PDCCH).

As described in the method (e.g., Proposal 1/Proposal 2/Proposal3/Proposal 4, etc.), the DCI may include at least one of a DMRS portrelated field (e.g., antenna port(s) field), a transport block relatedfield (e.g., MCS/New data indicator/RV field), a transmissionconfiguration indication (TCI) field, a time domain resource assignmentfield, or a redundancy version (RV) field.

For example, a plurality of TCI states may be indicated based on the TCIfield included in the DCI. When the plurality of TCI states isindicated, the UE may know that the relevant operation is an M-TRPoperation. As an example, two or more TCI states may be indicated inrelation to a URLLC M-TRP operation.

For example, resource assignment in a time domain for a firsttransmission occasion may be determined based on the time domainresource assignment field included in the DCI. Further, the resourceassignment in the time domain for a second transmission occasion may bedetermined based on the resource assignment in the time domain for thefirst transmission occasion. Through this, even though resourceassignment information in the time domain for the second transmissionoccasion is not included in the DCI, the resource assignment in the timedomain for the second transmission occasion may be determined. Throughthis, signaling overhead may be reduced and compatibility with aconventional DCI format may also be secured.

As a specific example, a size of a second resource in the time domainfor the second transmission occasion may be determined based on a sizeof a first resource in the time domain for the first transmissionoccasion. Further, the size of the first resource and the size of thesecond resource may be equal to each other. That is, the size of thesecond resource may be determined as a size which is the same as thesize of the first resource.

For example, the first resource and the second resource may beconstituted as a unit of 2, 4, or 7 OFDM symbols. The first resource andthe second resource may be positioned in concatenation with each otherin the time domain. Alternatively, a first symbol of the second resourcemay be positioned from a last symbol of the first resource after aspecific number of symbols. In this case, in the BS operation of FIG.20, the method may further include transmitting information on thespecific number of symbols. As an example, the information on thespecific number of symbols may also be transmitted while being includedin the configuration information.

For example, an operation of the BS (reference numeral 100/200 in FIGS.21 to 25) which transmits the DCI in step S2020 described above may beimplemented by the devices in FIGS. 21 to 25 to be described below. Forexample, referring to FIG. 22, one or more processors 102 may controlone or more transceivers 106 and/or one or more memories 104 so as totransmit the DCI and one or more transceivers 106 may transmit the DCI.

The BS may transmit a plurality of transmission occasions (S2050). Theplurality of transmission occasions may be transmitted based on the DCI.

For example, the plurality of transmission occasions may be the samePDSCH transmission occasion being repeatedly transmitted/received, asdescribed in the method (e.g., Proposal 1/Proposal 2/Proposal 3/Proposal4, etc.). In other words, the plurality of transmission occasions maycorrespond to the same transport block.

For example, the number of plurality of transmission occasions may bedetermined based on the number of TCI states indicated through the TCIfield of the DCI. As described above, since the plurality oftransmission occasions may be constituted by repeatedly transmitting thetransmission occasion corresponding to the same transport block, thenumber of plurality of transmission occasions may mean the number oftimes at which the transmission occasion is repeatedly transmitted. Asan example, when the plurality of TCI states is indicated through theTCI field of the DCI (e.g., 2 TCI states), the number oftransmitted/received transmission occasions may also be equal to thenumber of plurality of TCI states (e.g., 2 transmission occasions).

As a specific example, when a first TCI state and a second TCI state areindicated through the TCI field of the DCI, the UE may receive two,i.e., a first transmission occasion and a second transmission occasion.In this case, the first TCI state may correspond to the firsttransmission occasion and the second TCI state may correspond to thesecond transmission occasion. Further, the RV value of the firsttransmission occasion and the RV value of the second transmissionoccasion may be configured differently based on the RV field of the DCI.

As another example, the number of plurality of transmission occasionsmay also be determined based on the configuration information and theDCI. As an example, candidate values of the number of plurality oftransmission occasions may be indicated based on the configurationinformation, and one value of the candidate values may beindicated/configured based on the DCI.

For example, the plurality of transmission occasions (e.g., the firsttransmission occasion and the second transmission occasion) may bereceived in a time domain resource based on time division multiplexing(TDM). That is, the plurality of transmission occasions may berepeatedly received/transmitted in a time domain resource which is notoverlapped based on the TDM.

For example, each transmission occasion may be constituted by 2, 4, or 7OFDM symbols. This may correspond to the min-slot structure of PDSCHmapping type B described in the proposed method (e.g., Proposal1/Proposal 2/Proposal 3/Proposal 4, etc.) described above. The pluralityof transmission occasions (e.g., the first transmission occasion and thesecond transmission occasion) may be TDMed and received in one slot.Alternatively, each transmission occasion may be TDMed and received as aunit of slot.

For example, the plurality of transmission occasions may be received inthe resource of the time domain determined based on the DCI. As anexample, the first transmission occasion may be receive din a first timedomain resource and the second transmission occasion may be received ina second time domain resource. The first time domain resource and thesecond time domain resource may be positioned in concatenation with eachother. Alternatively, the second time domain resource may also bepositioned apart from the first time domain resource by a specificnumber of symbols. The specific number of symbols may be replaced withthe gap symbol/the shifting symbol/the symbol offset, and expressed. Thespecific number of symbols may be received through the higher layersignaling.

For example, an operation of the BS (reference numeral 100 and/or 200 inFIGS. 21 to 25) which transmits a plurality of transmission occasions instep S2050 described above may be implemented by the devices in FIGS. 21to 25 to be described below. For example, referring to FIG. 22, one ormore processors 102 may control one or more transceivers 106 and/or oneor more memories 104 so as to transmit the plurality of transmissionoccasions, and one or more transceivers 106 may transmit the pluralityof transmission occasions.

As mentioned above, the network side/UE signaling and operation (e.g.,Proposal 1/2/3/4, FIG. 18/19/20, etc.) may be implemented by devices(e.g., FIGS. 21 to 25) to be described below. For example, the networkside (e.g., TRP 1/TRP 2) may correspond to a first wireless device andthe UE may correspond to a second wireless device and in some cases, anopposite case thereto may also be considered. For example, the firstdevice (e.g., TRP 1)/the second device (e.g., TRP 2) may correspond tothe first wireless device and the UE may correspond to the secondwireless device and in some cases, an opposite case thereto may also beconsidered.

For example, the network side/UE signaling/operation (e.g., Proposal1/2/3/4/FIG. 18/19/20, etc.) may be processed by one or more processors(e.g., 102 and 202) in FIGS. 21 to 25 and the network side/UE signalingand operation (e.g., Proposal 1/2/3/4/FIG. 18/19/20, etc.) may be storedin one or more (e.g., 104 and 204) of FIG. 21) in the form of acommand/program (e.g., instruction and executable code) for driving atleast one processor (e.g., 102 and 202) in FIGS. 21 to 25.

According to an embodiment of the present disclosure, in a deviceincluding: one or more memories and one or more processors functionallyconnected to the one or more memories, the one or more processors may beconfigured to control the device to transmit a preamble for randomaccess, receive a response message for the random access correspondingto the preamble, a radio remote control (RRC) connection beingestablished based on the preamble and the response message, receiveconfiguration information, receive downlink control information (DCI)including a time domain resource assignment field, and receive aplurality of transmission occasions based on the DCI, a repetitionscheme based on time division multiplexing (TDM) may be configured basedon the configuration information, a first transmission occasion and asecond transmission occasion included in the plurality of transmissionoccasions may correspond to the same transport block, the firsttransmission occasion and the second transmission occasion may bereceived in different resources of a time domain based on TDM, resourceassignment in the time domain for the first transmission occasion may bedetermined based on the time domain resource assignment field of theDCI, and the resource assignment in the time domain for the secondtransmission occasion may be determined based on the resource assignmentin the time domain for the first transmission occasion.

According to an embodiment of the present disclosure, in one or morenon-transitory computer-readable media storing one or more instructions,the one or more instructions executable by one or more processors mayinclude instructions for instructing a user equipment (UE) to transmit apreamble for random access, receive a response message for the randomaccess corresponding to the preamble, a radio remote control (RRC)connection being established based on the preamble and the responsemessage, receive configuration information, receive downlink controlinformation (DCI) including a time domain resource assignment field, andreceive a plurality of transmission occasions based on the DCI, arepetition scheme based on time division multiplexing (TDM) may beconfigured based on the configuration information, a first transmissionoccasion and a second transmission occasion included in the plurality oftransmission occasions may correspond to the same transport block, thefirst transmission occasion and the second transmission occasion may bereceived in different resources of a time domain based on TDM, resourceassignment in the time domain for the first transmission occasion may bedetermined based on the time domain resource assignment field of theDCI, and the resource assignment in the time domain for the secondtransmission occasion may be determined based on the resource assignmentin the time domain for the first transmission occasion.

Communication System Applied to the Present Disclosure

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 21 illustrates a communication system applied to the presentdisclosure.

Referring to FIG. 21, a communication system applied to the presentdisclosure includes wireless devices, Base Stations (BSs), and anetwork. Herein, the wireless devices represent devices performingcommunication using Radio Access Technology (RAT) (e.g., 5G New RAT(NR)) or Long-Term Evolution (LTE)) and may be referred to ascommunication/radio/5G devices. The wireless devices may include,without being limited to, a robot 1010 a, vehicles 1010 b-1 and 1010b-2, an eXtended Reality (XR) device 1010 c, a hand-held device 1010 d,a home appliance 1010 e, an Internet of Things (IoT) device 1010 f, andan Artificial Intelligence (AI) device/server 400. For example, thevehicles may include a vehicle having a wireless communication function,an autonomous driving vehicle, and a vehicle capable of performingcommunication between vehicles. Herein, the vehicles may include anUnmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may includean Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) deviceand may be implemented in the form of a Head-Mounted Device (HMD), aHead-Up Display (HUD) mounted in a vehicle, a television, a smartphone,a computer, a wearable device, a home appliance device, a digitalsignage, a vehicle, a robot, etc. The hand-held device may include asmartphone, a smartpad, a wearable device (e.g., a smartwatch orsmartglasses), and a computer (e.g., a notebook). The home appliance mayinclude a TV, a refrigerator, and a washing machine. The IoT device mayinclude a sensor and a smartmeter. For example, the BSs and the networkmay be implemented as wireless devices and a specific wireless device200 a may operate as a BS/network node with respect to other wirelessdevices.

The wireless devices 1010 a to 1010 f may be connected to the network300 via the BSs 1020. An AI technology may be applied to the wirelessdevices 1010 a to 1010 f and the wireless devices 1010 a to 1010 f maybe connected to the AI server 400 via the network 300. The network 300may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G(e.g., NR) network. Although the wireless devices 1010 a to 1010 f maycommunicate with each other through the BSs 1020/network 300, thewireless devices 1010 a to 1010 f may perform direct communication(e.g., sidelink communication) with each other without passing throughthe BSs/network. For example, the vehicles 1010 b-1 and 1010 b-2 mayperform direct communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 1010 a to 1010 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 1010 a to 1010 f/BS 1020, or BS1020/BS 1020. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. Relay, Integrated AccessBackhaul (IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

Devices Applicable to the Present Disclosure

FIG. 22 illustrates wireless devices applicable to the presentdisclosure.

Referring to FIG. 22, a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 1010 x andthe BS 1020} and/or {the wireless device 1010 x and the wireless device1010 x} of FIG. 21.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include at least one processor 202and at least one memory 204 and additionally further include at leastone transceiver 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 206 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage medium, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. From RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. Using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.Processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

Signal Processing Circuit Example to which Disclosure is Applied

FIG. 23 illustrates a signal processing circuit for a transmit signal.

Referring to FIG. 23, a signal processing circuit 1000 may include ascrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040,a resource mapper 1050, and a signal generator 1060. Although notlimited thereto, an operation/function of FIG. 23 may be performed bythe processors 102 and 202 and/or the transceivers 106 and 206 of FIG.22. Hardware elements of FIG. 23 may be implemented in the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 22. For example,blocks 1010 to 1060 may be implemented in the processors 102 and 202 ofFIG. 22. Further, blocks 1010 to 1050 may be implemented in theprocessors 102 and 202 of FIG. 22 and the block 1060 of FIG. 22 and theblock 2060 may be implemented in the transceivers 106 and 206 of FIG.22.

A codeword may be transformed into a radio signal via the signalprocessing circuit 1000 of FIG. 23. Here, the codeword is an encoded bitsequence of an information block. The information block may includetransport blocks (e.g., a UL-SCH transport block and a DL-SCH transportblock). The radio signal may be transmitted through various physicalchannels (e.g., PUSCH and PDSCH).

Specifically, the codeword may be transformed into a bit sequencescrambled by the scrambler 1010. A scramble sequence used for scramblingmay be generated based on an initialization value and the initializationvalue may include ID information of a wireless device. The scrambled bitsequence may be modulated into a modulated symbol sequence by themodulator 1020. A modulation scheme may include pi/2-BPSK (pi/2-BinaryPhase Shift Keying), m-PSK (m-Phase Shift Keying), m-QAM (m-QuadratureAmplitude Modulation), etc. A complex modulated symbol sequence may bemapped to one or more transport layers by the layer mapper 1030.Modulated symbols of each transport layer may be mapped to acorresponding antenna port(s) by the precoder 1040 (precoding). Output zof the precoder 1040 may be obtained by multiplying output y of thelayer mapper 1030 by precoding matrix W of N*M. Here, N represents thenumber of antenna ports and M represents the number of transport layers.Here, the precoder 1040 may perform precoding after performing transformprecoding (e.g., DFT transform) for complex modulated symbols. Further,the precoder 1040 may perform the precoding without performing thetransform precoding.

The resource mapper 1050 may map the modulated symbols of each antennaport to a time-frequency resource. The time-frequency resource mayinclude a plurality of symbols (e.g., CP-OFDMA symbol and DFT-s-OFDMAsymbol) in a time domain and include a plurality of subcarriers in afrequency domain. The signal generator 1060 may generate the radiosignal from the mapped modulated symbols and the generated radio signalmay be transmitted to another device through each antenna. To this end,the signal generator 1060 may include an Inverse Fast Fourier Transform(IFFT) module, a Cyclic Prefix (CP) inserter, a Digital-to-AnalogConverter (DAC), a frequency uplink converter, and the like.

A signal processing process for a receive signal in the wireless devicemay be configured in the reverse of the signal processing process (1010to 1060) of FIG. 23. For example, the wireless device (e.g., 100 or 200of FIG. 22) may receive the radio signal from the outside through theantenna port/transceiver. The received radio signal may be transformedinto a baseband signal through a signal reconstructer. To this end, thesignal reconstructer may include a frequency downlink converter, ananalog-to-digital converter (ADC), a CP remover, and a Fast FourierTransform (FFT) module. Thereafter, the baseband signal may bereconstructed into the codeword through a resource de-mapper process, apostcoding process, a demodulation process, and a de-scrambling process.The codeword may be reconstructed into an original information block viadecoding. Accordingly, a signal processing circuit (not illustrated) forthe receive signal may include a signal reconstructer, a resourcedemapper, a postcoder, a demodulator, a descrambler, and a decoder.

Example of a Wireless Device Applied to the Present Disclosure

FIG. 24 illustrates another example of a wireless device applied to thepresent disclosure. The wireless device may be implemented in variousforms according to a use-case/service (see FIG. 21).

Referring to FIG. 24, wireless devices 1010 and 1020 may correspond tothe wireless devices 100 and 200 of FIG. 22 and may be configured byvarious elements, components, units/portions, and/or modules. Forexample, each of the wireless devices 1010 and 2010 may include acommunication unit 110, a control unit 120, a memory unit 130, andadditional components 140. The communication unit may include acommunication circuit 112 and transceiver(s) 114. For example, thecommunication circuit 112 may include the one or more processors 102 and202 and/or the one or more memories 104 and 104 of FIG. 22. For example,the transceiver(s) 114 may include the one or more transceivers 106 and106 and/or the one or more antennas 108 and 108 of FIG. 22. The controlunit 120 is electrically connected to the communication unit 110, thememory 130, and the additional components 140 and controls overalloperation of the wireless devices. For example, the control unit 120 maycontrol an electric/mechanical operation of the wireless device based onprograms/code/commands/information stored in the memory unit 130. Thecontrol unit 120 may transmit the information stored in the memory unit130 to the exterior (e.g., other communication devices) via thecommunication unit 110 through a wireless/wired interface or store, inthe memory unit 130, information received through the wireless/wiredinterface from the exterior (e.g., other communication devices) via thecommunication unit 110).

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (1010 aof FIG. 21), the vehicles (1010 b-1 and 1010 b-2 of FIG. 21), the XRdevice (1010 c of FIG. 21), the hand-held device (1010 d of FIG. 21),the home appliance (1010 e of FIG. 21), the IoT device (1010 f of FIG.21), a digital broadcast terminal, a hologram device, a public safetydevice, an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 21), the BSs (1020 of FIG. 21), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 22, the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 100 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 100, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 100 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Portable Device Example to which Disclosure is Applied

FIG. 25 illustrates a portable device applied to the present disclosure.The portable device may include a smart phone, a smart pad, a wearabledevice (e.g., a smart watch, a smart glass), and a portable computer(e.g., a notebook, etc.). The portable device may be referred to as aMobile Station (MS), a user terminal (UT), a Mobile Subscriber Station(MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or aWireless terminal (WT).

Referring to FIG. 25, a portable device 1010 may include an antenna unit108, a communication unit 110, a control unit 120, a memory unit 130, apower supply unit 140 a, an interface unit 140 b, and an input/outputunit 140 c. The antenna unit 108 may be configured as a part of thecommunication unit 110. The blocks 110 to 130/140 a to 140 c correspondto the blocks 110 to 130/140 of FIG. 24, respectively.

The communication unit 110 may transmit/receive a signal (e.g., data, acontrol signal, etc.) to/from another wireless device and eNBs. Thecontrol unit 120 may perform various operations by controllingcomponents of the portable device 1010. The control unit 120 may includean Application Processor (AP). The memory unit 130 may storedata/parameters/programs/codes/instructions required for driving theportable device 1010. Further, the memory unit 130 may storeinput/output data/information, etc. The power supply unit 140 a maysupply power to the portable device 1010 and include a wired/wirelesscharging circuit, a battery, and the like. The interface unit 140 b maysupport a connection between the portable device 1010 and anotherexternal device. The interface unit 140 b may include various ports(e.g., an audio input/output port, a video input/output port) for theconnection with the external device. The input/output unit 140 c mayreceive or output a video information/signal, an audioinformation/signal, data, and/or information input from a user. Theinput/output unit 140 c may include a camera, a microphone, a user inputunit, a display unit 140 d, a speaker, and/or a haptic module.

As one example, in the case of data communication, the input/output unit140 c may acquire information/signal (e.g., touch, text, voice, image,and video) input from the user and the acquired information/signal maybe stored in the memory unit 130. The communication unit 110 maytransform the information/signal stored in the memory into the radiosignal and directly transmit the radio signal to another wireless deviceor transmit the radio signal to the eNB. Further, the communication unit110 may receive the radio signal from another wireless device or eNB andthen reconstruct the received radio signal into originalinformation/signal. The reconstructed information/signal may be storedin the memory unit 130 and then output in various forms (e.g., text,voice, image, video, haptic) through the input/output unit 140 c.

Here, wireless communication technology implemented in wireless devices100 and 200 of the present disclosure may include Narrowband Internet ofThings for low-power communication in addition to LTE, NR, and 6G. Inthis case, for example, NB-IoT technology may be an example of Low PowerWide Area Network (LPWAN) technology and may be implemented as standardssuch as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the namedescribed above. Additionally or alternatively, the wirelesscommunication technology implemented in the wireless devices 100 and 200of the present disclosure may perform communication based on LTE-Mtechnology. In this case, as an example, the LTE-M technology may be anexample of the LPWAN and may be called various names including enhancedMachine Type Communication (eMTC), and the like. For example, the LTE-Mtechnology may be implemented as at least any one of various standardssuch as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BandwidthLimited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or7) LTE M. Additionally or alternatively, the wireless communicationtechnology implemented in the wireless devices 100 and 200 of thepresent disclosure may includes at least one of ZigBee, Bluetooth, andLow Power Wide Area Network (LPWAN) considering the low-powercommunication, and is not limited to the name described above. As anexample, the ZigBee technology may generate personal area networks (PAN)associated with small/low-power digital communication based on variousstandards including IEEE 802.15.4, and the like, and may be calledvarious names.

The embodiments described above are implemented by combinations ofcomponents and features of the present disclosure in predeterminedforms. Each component or feature should be considered selectively unlessspecified separately. Each component or feature may be carried outwithout being combined with another component or feature. Moreover, somecomponents and/or features are combined with each other and mayimplement embodiments of the present disclosure. The order of operationsdescribed in embodiments of the present disclosure may be changed. Somecomponents or features of one embodiment may be included in anotherembodiment, or may be replaced by corresponding components or featuresof another embodiment. It is apparent that some claims referring tospecific claims may be combined with another claims referring to theclaims other than the specific claims to constitute the embodiment oradd new claims by means of amendment after the application is filed.

Embodiments of the present disclosure may be implemented by variousmeans, for example, hardware, firmware, software, or combinationsthereof. When embodiments are implemented by hardware, one embodiment ofthe present disclosure may be implemented by one or more applicationspecific integrated circuits (ASICs), digital signal processors (DSPs),digital signal processing devices (DSPDs), programmable logic devices(PLDs), field programmable gate arrays (FPGAs), processors, controllers,microcontrollers, microprocessors, and the like.

When embodiments are implemented by firmware or software, one embodimentof the present disclosure may be implemented by modules, procedures,functions, etc. Performing functions or operations described above.Software code may be stored in a memory and may be driven by aprocessor. The memory is provided inside or outside the processor andmay exchange data with the processor by various well-known means.

It is apparent to those skilled in the art that the present disclosuremay be embodied in other specific forms without departing from essentialfeatures of the present disclosure. Accordingly, the aforementioneddetailed description should not be construed as limiting in all aspectsand should be considered as illustrative. The scope of the presentdisclosure should be determined by rational construing of the appendedclaims, and all modifications within an equivalent scope of the presentdisclosure are included in the scope of the present disclosure.

Although the method of transmitting and receiving data in the wirelesscommunication system of the present disclosure has been described inconnection with examples in which it applies to 3GPP LTE/LTE-A systemand 5G systems (new RAT systems), the method is also applicable to othervarious wireless communication systems.

1. A method for receiving, by a user equipment (UE), downlink data in awireless communication system, the method comprising: receivingconfiguration information, wherein a repetition scheme based on timedivision multiplexing (TDM) is configured based on the configurationinformation; receiving downlink control information (DCI), wherein theDCI includes a time domain resource assignment field; and receiving afirst Physical Downlink Shared Channel (PDSCH) transmission occasion anda second PDSCH transmission occasion, based on the DCI, wherein a firsttransport block related to the first PDSCH transmission occasion is sameas a second transport block related to the second PDSCH transmissionoccasion, wherein time domain resource assignment for the first PDSCHtransmission occasion is determined based on the time domain resourceassignment field, and wherein time domain resource assignment for thesecond PDSCH transmission occasion is determined based on the timedomain resource assignment for the first PDSCH transmission occasion. 2.The method of claim 1, wherein a size of a second resource in a timedomain for the second PDSCH transmission occasion is determined based ona size of a first resource in the time domain for the first PDSCHtransmission occasion, and wherein the size of the second resource isdetermined to be equal to the size of the first resource.
 3. The methodof claim 2, wherein the first resource and the second resource areconstituted based on a unit of 2, 4, or 7 OFDM symbols.
 4. The method ofclaim 2, wherein a first symbol of the second resource is located to beapart from a last symbol of the first resource as a pre-defined numberof symbols.
 5. The method of claim 4, further comprising: receivinginformation on the pre-defined number of symbols.
 6. The method of claim2, wherein the first resource and the second resource are positioned inconcatenation with each other in the time domain.
 7. The method of claim1, wherein the DCI further includes a transmission configurationindication (TCI) field, wherein two TCI states are indicated by the TCIfield.
 8. The method of claim 7, wherein a first TCI state among the twoTCI states is related to the first PDSCH transmission occasion and asecond TCI state among the two TCI states is related to the second PDSCHtransmission occasion.
 9. The method of claim 1, wherein the first PDSCHtransmission occasion is received in one slot and the second PDSCHtransmission occasion is received in one slot identical to the one slotin which the first PDSCH transmission occasion is received.
 10. Themethod of claim 1, wherein the DCI further includes a redundancy version(RV) field, and wherein an RV value of the first PDSCH transmissionoccasion is configured to be different from an RV value of the secondPDSCH transmission occasion, based on the RV field.
 11. A user equipment(UE) for receiving downlink data in a wireless communication system, theUE comprising: one or more transceivers; one or more processors; and oneor more memories storing instructions for operations executed by the oneor more processors and connected to the one or more processors, whereinthe operations include receiving configuration information, wherein arepetition scheme based on time division multiplexing (TDM) isconfigured based on the configuration information, receiving downlinkcontrol information (DCI), wherein the DCI includes a time domainresource assignment field, and receiving a first Physical DownlinkShared Channel (PDSCH) transmission occasion and a second PDSCHtransmission occasion, based on the DCI, wherein a first transport blockrelated to the first PDSCH transmission occasion is same as a secondtransport block related to the second PDSCH transmission occasion,wherein time domain resource assignment for the first PDSCH transmissionoccasion is determined based on the time domain resource assignmentfield, and wherein time domain resource assignment for the second PDSCHtransmission occasion is determined based on the time domain resourceassignment for the first PDSCH transmission occasion.
 12. The UE ofclaim 11, wherein a size of a second resource in a time domain for thesecond PDSCH transmission occasion is determined based on a size of afirst resource in the time domain for the first PDSCH transmissionoccasion, and wherein the size of the second resource is determined tobe equal to the size of the second resource.
 13. The UE of claim 12,wherein the first resource and the second resource are positioned inconcatenation with each other in the time domain.
 14. The UE of claim11, wherein the DCI further includes a transmission configurationindication (TCI) field, wherein two TCI states are indicated by the TCIfield.
 15. The UE of claim 14, wherein a first TCI state among the twoTCI states is related to the first PDSCH transmission occasion and asecond TCI state among the two TCI states is related to the second PDSCHtransmission occasion.
 16. A method for transmitting, by a base station(BS), downlink data in a wireless communication system, the methodcomprising: transmitting, to a user equipment (UE), configurationinformation, wherein a repetition scheme based on time divisionmultiplexing (TDM) is configured based on the configuration information;transmitting, to the UE, downlink control information (DCI), wherein theDCI includes a time domain resource assignment field, and transmitting,to the UE, a first Physical Downlink Shared Channel (PDSCH) transmissionoccasion and a second PDSCH transmission occasion, based on the DCI,wherein a first transport block related to the first PDSCH transmissionoccasion is same as a second transport block related to the second PDSCHtransmission occasion, wherein time domain resource assignment for thefirst PDSCH transmission occasion is determined based on the time domainresource assignment field, and wherein time domain resource assignmentfor the second PDSCH transmission occasion is determined based on thetime domain resource assignment for the first PDSCH transmissionoccasion.